fix

frontend/src/desktop/useDocumentDrag.js

@@ -522,13 +522,20 @@ const useDocumentDrag = () => {
         }
         state.moved = true;
         if (!state.groupElevated) {
-          state.groupDocIds.forEach((id) => {
-            if (id === state.docKey) {
-              bringToFront(state.docId);
-            } else {
-              bringToFront(id);
-            }
+          const layout = layoutRef.current;
+          const sortedGroup = state.groupDocIds
+            .filter((id) => id !== state.docKey)
+            .sort((a, b) => {
+              const aZ = layout.get(a)?.z ?? 0;
+              const bZ = layout.get(b)?.z ?? 0;
+              return aZ - bZ;
+            });
+
+          sortedGroup.forEach((id) => {
+            bringToFront(id);
           });
+
+          bringToFront(state.docId);
           state.groupElevated = true;
         }
       }