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client/src/pages/TutorialTasks.tsx

@@ -78,6 +78,18 @@ const TutorialTasks: React.FC = () => {
   const submissionsContainerRefs = useRef<{[key: string]: HTMLDivElement | null}>({});
   const withPreservedScroll = useRef<(fn: () => void) => void>();
 
+  const setGlobalAnchorDisabled = (disabled: boolean) => {
+    try {
+      if (disabled) {
+        document.documentElement.style.setProperty('overflow-anchor', 'none');
+        document.body.style.setProperty('overflow-anchor', 'none');
+      } else {
+        document.documentElement.style.removeProperty('overflow-anchor');
+        document.body.style.removeProperty('overflow-anchor');
+      }
+    } catch {}
+  };
+
   // Minimal, local scroll-stability helpers for submit/delete
   const lockListHeight = () => {
     const el = listRef.current;
@@ -787,6 +799,7 @@ const TutorialTasks: React.FC = () => {
 
     try {
       setMutatingTaskId(taskId);
+      setGlobalAnchorDisabled(true);
       lockListHeight();
       lockCardHeightById(taskId);
       lockGridHeightById(taskId);
@@ -831,6 +844,7 @@ const TutorialTasks: React.FC = () => {
         unlockGridHeightById(taskId);
       }));
       setMutatingTaskId(null);
+      setGlobalAnchorDisabled(false);
     }
   };
 
@@ -877,6 +891,7 @@ const TutorialTasks: React.FC = () => {
 
     try {
       if (taskId) setMutatingTaskId(taskId);
+      setGlobalAnchorDisabled(true);
       lockListHeight();
       const response = await api.delete(`/api/submissions/${submissionId}`);
 
@@ -905,6 +920,7 @@ const TutorialTasks: React.FC = () => {
         unlockGridHeightById(taskId);
       }
       setMutatingTaskId(null);
+      setGlobalAnchorDisabled(false);
     }));
   };