diff --git a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/helpers/contentHelpers.ts b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/helpers/contentHelpers.ts
index 1159d310..857aeaf7 100644
--- a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/helpers/contentHelpers.ts
+++ b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/helpers/contentHelpers.ts
@@ -55,6 +55,22 @@ export function schedulePendingAdditionForSig(
   );
 }
 
+export function mergeLocalPendingAdditions(
+  serverSigs: ExtendedSystemSignature[],
+  localSigs: ExtendedSystemSignature[],
+): ExtendedSystemSignature[] {
+  const now = Date.now();
+  const pendingAdditions = localSigs.filter(sig => sig.pendingAddition && sig.pendingUntil && sig.pendingUntil > now);
+  const mergedMap = new Map<string, ExtendedSystemSignature>();
+  serverSigs.forEach(sig => mergedMap.set(sig.eve_id, sig));
+  pendingAdditions.forEach(sig => {
+    if (!mergedMap.has(sig.eve_id)) {
+      mergedMap.set(sig.eve_id, sig);
+    }
+  });
+  return Array.from(mergedMap.values());
+}
+
 export function scheduleLazyDeletionTimers(
   toRemove: ExtendedSystemSignature[],
   setPendingMap: React.Dispatch<React.SetStateAction<Record<string, { finalUntil: number; finalTimeoutId: number }>>>,
diff --git a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/types.ts b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/types.ts
index d215125b..8c4ca3da 100644
--- a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/types.ts
+++ b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/types.ts
@@ -1,10 +1,5 @@
-// types.ts
 import { ExtendedSystemSignature } from '../helpers/contentHelpers';
-import { OutCommandHandler } from '@/hooks/Mapper/types/mapHandlers'; // or your function type
 
-/**
- * The aggregator’s props
- */
 export interface UseSystemSignaturesDataProps {
   systemId: string;
   settings: { key: string; value: boolean }[];
@@ -14,9 +9,6 @@ export interface UseSystemSignaturesDataProps {
   onLazyDeleteChange?: (value: boolean) => void;
 }
 
-/**
- * The minimal fetch logic
- */
 export interface UseFetchingParams {
   systemId: string;
   signaturesRef: React.MutableRefObject<ExtendedSystemSignature[]>;
@@ -24,17 +16,11 @@ export interface UseFetchingParams {
   localPendingDeletions: ExtendedSystemSignature[];
 }
 
-/**
- * For the deletion sub-hook
- */
 export interface UsePendingDeletionParams {
   systemId: string;
   setSignatures: React.Dispatch<React.SetStateAction<ExtendedSystemSignature[]>>;
 }
 
-/**
- * For the additions sub-hook
- */
 export interface UsePendingAdditionParams {
   setSignatures: React.Dispatch<React.SetStateAction<ExtendedSystemSignature[]>>;
 }
diff --git a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingAdditions.ts b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingAdditions.ts
index abaa3bb3..dbba5def 100644
--- a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingAdditions.ts
+++ b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingAdditions.ts
@@ -5,12 +5,20 @@ import { FINAL_DURATION_MS } from '../constants';
 
 export function usePendingAdditions({ setSignatures }: UsePendingAdditionParams) {
   const [pendingUndoAdditions, setPendingUndoAdditions] = useState<ExtendedSystemSignature[]>([]);
-
   const pendingAdditionMapRef = useRef<Record<string, { finalUntil: number; finalTimeoutId: number }>>({});
 
   const processAddedSignatures = useCallback(
     (added: ExtendedSystemSignature[]) => {
       if (!added.length) return;
+      const now = Date.now();
+      setSignatures(prev => [
+        ...prev,
+        ...added.map(sig => ({
+          ...sig,
+          pendingAddition: true,
+          pendingUntil: now + FINAL_DURATION_MS,
+        })),
+      ]);
       added.forEach(sig => {
         schedulePendingAdditionForSig(
           sig,
@@ -29,7 +37,6 @@ export function usePendingAdditions({ setSignatures }: UsePendingAdditionParams)
       clearTimeout(finalTimeoutId);
     });
     pendingAdditionMapRef.current = {};
-
     setSignatures(prev =>
       prev.map(x => (x.pendingAddition ? { ...x, pendingAddition: false, pendingUntil: undefined } : x)),
     );
diff --git a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingDeletions.ts b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingDeletions.ts
index f08a29c6..aeafcb58 100644
--- a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingDeletions.ts
+++ b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/usePendingDeletions.ts
@@ -19,14 +19,28 @@ export function usePendingDeletions({ systemId, setSignatures }: UsePendingDelet
       updated: ExtendedSystemSignature[],
     ) => {
       if (!removed.length) return;
-      const processedRemoved = removed.map(r => ({ ...r, pendingDeletion: true, pendingAddition: false }));
+      const now = Date.now();
+      const processedRemoved = removed.map(r => ({
+        ...r,
+        pendingDeletion: true,
+        pendingAddition: false,
+        pendingUntil: now + FINAL_DURATION_MS,
+      }));
       setLocalPendingDeletions(prev => [...prev, ...processedRemoved]);
 
-      const resp = await outCommand({
+      outCommand({
         type: OutCommand.updateSignatures,
         data: prepareUpdatePayload(systemId, added, updated, []),
       });
-      const updatedFromServer = resp.signatures as ExtendedSystemSignature[];
+
+      setSignatures(prev =>
+        prev.map(sig => {
+          if (processedRemoved.find(r => r.eve_id === sig.eve_id)) {
+            return { ...sig, pendingDeletion: true, pendingUntil: now + FINAL_DURATION_MS };
+          }
+          return sig;
+        }),
+      );
 
       scheduleLazyDeletionTimers(
         processedRemoved,
@@ -41,18 +55,6 @@ export function usePendingDeletions({ systemId, setSignatures }: UsePendingDelet
         },
         FINAL_DURATION_MS,
       );
-
-      const now = Date.now();
-      const updatedWithRemoval = updatedFromServer.map(sig => {
-        const wasRemoved = processedRemoved.find(r => r.eve_id === sig.eve_id);
-        return wasRemoved ? { ...sig, pendingDeletion: true, pendingUntil: now + FINAL_DURATION_MS } : sig;
-      });
-
-      const extras = processedRemoved
-        .map(r => ({ ...r, pendingDeletion: true, pendingUntil: now + FINAL_DURATION_MS }))
-        .filter(r => !updatedWithRemoval.some(m => m.eve_id === r.eve_id));
-
-      setSignatures([...updatedWithRemoval, ...extras]);
     },
     [systemId, outCommand, setSignatures],
   );
@@ -60,7 +62,6 @@ export function usePendingDeletions({ systemId, setSignatures }: UsePendingDelet
   const clearPendingDeletions = useCallback(() => {
     Object.values(pendingDeletionMap).forEach(({ finalTimeoutId }) => clearTimeout(finalTimeoutId));
     setPendingDeletionMap({});
-
     setSignatures(prev =>
       prev.map(x => (x.pendingDeletion ? { ...x, pendingDeletion: false, pendingUntil: undefined } : x)),
     );
@@ -72,7 +73,6 @@ export function usePendingDeletions({ systemId, setSignatures }: UsePendingDelet
     setLocalPendingDeletions,
     pendingDeletionMap,
     setPendingDeletionMap,
-
     processRemovedSignatures,
     clearPendingDeletions,
   };
diff --git a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSignatureFetching.ts b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSignatureFetching.ts
index 67e3bb04..740cc488 100644
--- a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSignatureFetching.ts
+++ b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSignatureFetching.ts
@@ -1,8 +1,9 @@
 import { useCallback } from 'react';
 import { SystemSignature } from '@/hooks/Mapper/types';
 import { OutCommand } from '@/hooks/Mapper/types/mapHandlers';
-import { ExtendedSystemSignature, prepareUpdatePayload, getActualSigs } from '../helpers';
+import { ExtendedSystemSignature, prepareUpdatePayload, getActualSigs, mergeLocalPendingAdditions } from '../helpers';
 import { UseFetchingParams } from './types';
+import { FINAL_DURATION_MS } from '../constants';
 import { useMapRootState } from '@/hooks/Mapper/mapRootProvider';
 
 export function useSignatureFetching({
@@ -33,7 +34,7 @@ export function useSignatureFetching({
       ...s,
       character_name: characters.find(c => c.eve_id === s.character_eve_id)?.name,
     })) as ExtendedSystemSignature[];
-    setSignatures(extended);
+    setSignatures(prev => mergeLocalPendingAdditions(extended, prev));
   }, [characters, systemId, localPendingDeletions, outCommand, setSignatures]);
 
   const handleUpdateSignatures = useCallback(
@@ -45,12 +46,24 @@ export function useSignatureFetching({
         skipUpdateUntouched,
       );
 
+      if (added.length > 0) {
+        const now = Date.now();
+        setSignatures(prev => [
+          ...prev,
+          ...added.map(a => ({
+            ...a,
+            pendingAddition: true,
+            pendingUntil: now + FINAL_DURATION_MS,
+          })),
+        ]);
+      }
+
       await outCommand({
         type: OutCommand.updateSignatures,
         data: prepareUpdatePayload(systemId, added, updated, removed),
       });
     },
-    [systemId, signaturesRef, outCommand],
+    [systemId, outCommand, signaturesRef, setSignatures],
   );
 
   return {
diff --git a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSystemSignaturesData.ts b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSystemSignaturesData.ts
index cab79aaf..20085fa5 100644
--- a/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSystemSignaturesData.ts
+++ b/assets/js/hooks/Mapper/components/mapInterface/widgets/SystemSignatures/hooks/useSystemSignaturesData.ts
@@ -1,6 +1,5 @@
 import { useCallback, useEffect, useState } from 'react';
 import useRefState from 'react-usestateref';
-import { useMapRootState } from '@/hooks/Mapper/mapRootProvider';
 import { useMapEventListener } from '@/hooks/Mapper/events';
 import { Commands, SystemSignature } from '@/hooks/Mapper/types';
 import { OutCommand } from '@/hooks/Mapper/types/mapHandlers';
@@ -9,13 +8,14 @@ import {
   KEEP_LAZY_DELETE_SETTING,
   LAZY_DELETE_SIGNATURES_SETTING,
 } from '@/hooks/Mapper/components/mapInterface/widgets';
-import { ExtendedSystemSignature, getActualSigs } from '../helpers';
+import { ExtendedSystemSignature, getActualSigs, mergeLocalPendingAdditions } from '../helpers';
 import { useSignatureFetching } from './useSignatureFetching';
 import { usePendingAdditions } from './usePendingAdditions';
 import { usePendingDeletions } from './usePendingDeletions';
 import { UseSystemSignaturesDataProps } from './types';
 import { TIME_ONE_DAY, TIME_ONE_WEEK } from '../constants';
 import { SignatureGroup } from '@/hooks/Mapper/types';
+import { useMapRootState } from '@/hooks/Mapper/mapRootProvider';
 
 export function useSystemSignaturesData({
   systemId,
@@ -25,9 +25,7 @@ export function useSystemSignaturesData({
   onLazyDeleteChange,
 }: UseSystemSignaturesDataProps) {
   const { outCommand } = useMapRootState();
-
   const [signatures, setSignatures, signaturesRef] = useRefState<ExtendedSystemSignature[]>([]);
-
   const [selectedSignatures, setSelectedSignatures] = useState<ExtendedSystemSignature[]>([]);
 
   const { localPendingDeletions, setLocalPendingDeletions, processRemovedSignatures, clearPendingDeletions } =
@@ -51,7 +49,6 @@ export function useSystemSignaturesData({
   const handlePaste = useCallback(
     async (clipboardString: string) => {
       const lazyDeleteValue = settings.find(s => s.key === LAZY_DELETE_SIGNATURES_SETTING)?.value ?? false;
-
       const incomingSignatures = parseSignatures(
         clipboardString,
         settings.map(s => s.key),
@@ -79,8 +76,15 @@ export function useSystemSignaturesData({
             removed: [],
           },
         });
-        const finalSigs = (resp.signatures ?? []) as SystemSignature[];
-        setSignatures(finalSigs.map(x => ({ ...x })));
+        if (resp) {
+          const finalSigs = (resp.signatures ?? []) as SystemSignature[];
+          setSignatures(prev =>
+            mergeLocalPendingAdditions(
+              finalSigs.map(x => ({ ...x })),
+              prev,
+            ),
+          );
+        }
       }
 
       const keepLazy = settings.find(s => s.key === KEEP_LAZY_DELETE_SETTING)?.value ?? false;
@@ -115,16 +119,9 @@ export function useSystemSignaturesData({
   const undoPending = useCallback(() => {
     clearPendingDeletions();
     clearPendingAdditions();
-
     setSignatures(prev =>
-      prev.map(x => {
-        if (x.pendingDeletion) {
-          return { ...x, pendingDeletion: false, pendingUntil: undefined };
-        }
-        return x;
-      }),
+      prev.map(x => (x.pendingDeletion ? { ...x, pendingDeletion: false, pendingUntil: undefined } : x)),
     );
-
     if (pendingUndoAdditions.length) {
       pendingUndoAdditions.forEach(async sig => {
         await outCommand({
@@ -140,7 +137,6 @@ export function useSystemSignaturesData({
       setSignatures(prev => prev.filter(x => !pendingUndoAdditions.some(u => u.eve_id === x.eve_id)));
       setPendingUndoAdditions([]);
     }
-
     setLocalPendingDeletions([]);
   }, [
     clearPendingDeletions,