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client/src/pages/TutorialTasks.tsx

@@ -989,12 +989,28 @@ const TutorialTasks: React.FC = () => {
               requestAnimationFrame(() => setSpacerHeights(prev => ({ ...prev, [taskId]: 0 })));
             });
           } else {
-            // Safari: delay refetch until after unlock to avoid visible reflow
+            // Safari: delay refetch and keep locks until refetch completes
+            pendingUnlocksRef.current.add(taskId);
             setTimeout(() => {
               api.get(`/api/submissions/by-source/${taskId}`).then(r => {
                 const list = (r.data && r.data.submissions) || [];
                 setUserSubmissions(prev => ({ ...prev, [taskId]: list }));
-              }).catch(() => {});
+                requestAnimationFrame(() => {
+                  unlockListHeight();
+                  unlockCardHeightById(taskId);
+                  unlockGridHeightById(taskId);
+                  unlockContainerHeightById(taskId);
+                  pendingUnlocksRef.current.delete(taskId);
+                });
+              }).catch(() => {
+                requestAnimationFrame(() => {
+                  unlockListHeight();
+                  unlockCardHeightById(taskId);
+                  unlockGridHeightById(taskId);
+                  unlockContainerHeightById(taskId);
+                  pendingUnlocksRef.current.delete(taskId);
+                });
+              });
             }, 300);
           }
         });