diff --git a/frontend/src/features/editor/EditorApp.tsx b/frontend/src/features/editor/EditorApp.tsx
index 6f2991a..64f5397 100644
--- a/frontend/src/features/editor/EditorApp.tsx
+++ b/frontend/src/features/editor/EditorApp.tsx
@@ -83,16 +83,17 @@ function EditorApp() {
 
   const { holdModels, holdModelsGLBURL } = useMemo(() => {
     const holdModels: SessionHoldInstance[] = [];
-    const holdModelsGLBURL: string[] = [];
+    const glbUrlSet = new Set<string>();
     if (session_data?.related_holds_collection) {
       session_data.holds_collection_instances?.forEach((hold: SessionHoldInstance) => {
-        hold.hold_instance_id = hold.id;
-        holdModels.push(hold);
-        if (hold.hold_type?.glb_url) {
-          holdModelsGLBURL.push(hold.hold_type.glb_url);
+        const holdWithId = { ...hold, hold_instance_id: hold.id };
+        holdModels.push(holdWithId);
+        if (holdWithId.hold_type?.glb_url) {
+          glbUrlSet.add(holdWithId.hold_type.glb_url);
         }
       });
     }
+    const holdModelsGLBURL = Array.from(glbUrlSet);
     return { holdModels, holdModelsGLBURL };
   }, [session_data?.related_holds_collection, session_data?.holds_collection_instances]);
 
diff --git a/frontend/src/features/editor/components/AddHoldModal.tsx b/frontend/src/features/editor/components/AddHoldModal.tsx
index 1538324..4bd4a87 100644
--- a/frontend/src/features/editor/components/AddHoldModal.tsx
+++ b/frontend/src/features/editor/components/AddHoldModal.tsx
@@ -110,7 +110,7 @@ export default function AddHoldModal({
     ? deduplicatedStockData.filter(
         (hold: StockItem) =>
           !currentHoldTypeIds.has(hold.hold_type.id) &&
-          !addedHoldIds.has(hold.hold_type.id as number)
+          !addedHoldIds.has(hold.hold_type.id)
       )
     : deduplicatedStockData;