This happens when persistent volume is protected. You should be able to cross verify this:
Command:
kubectl describe pvc PVC_NAME | grep Finalizers
Output:
Finalizers: [kubernetes.io/pvc-protection]
You can fix this by setting finalizers to null using kubectl patch:
kubectl patch pvc PVC_NAME -p '{"metadata":{"finalizers": []}}' --type=merge
Ref; Storage Object in Use Protection