diff --git a/src/Web/StellaOps.Web/src/app/features/policy-studio/services/policy-pack.store.ts b/src/Web/StellaOps.Web/src/app/features/policy-studio/services/policy-pack.store.ts
index a2f2d9816..85db19320 100644
--- a/src/Web/StellaOps.Web/src/app/features/policy-studio/services/policy-pack.store.ts
+++ b/src/Web/StellaOps.Web/src/app/features/policy-studio/services/policy-pack.store.ts
@@ -98,7 +98,13 @@ export class PolicyPackStore {
       const raw = sessionStorage.getItem(this.cacheKey);
       if (!raw) return null;
       const parsed = JSON.parse(raw) as PolicyPackSummary[];
-      return Array.isArray(parsed) && parsed.length > 0 ? parsed : null;
+      if (!Array.isArray(parsed) || parsed.length === 0) return null;
+      // Reject stale cache entries that have packId instead of id (old API format)
+      if (!parsed[0].id && (parsed[0] as any).packId) {
+        sessionStorage.removeItem(this.cacheKey);
+        return null;
+      }
+      return parsed;
     } catch {
       return null;
     }