@Arun Manocha​, You can check it in the Azure portal. I believe the running instances should have the pool name tagged. So you can do a backtrace and check the cluster tag for that instance. Then take the cluster-ID to the Databricks clusters page and use the cluster-ID in the cluster URL to get the running cluster. Once you get the group, you can find what is using the two instances. If you are still unable to find the instance, it could be a UI bug or some other issue. In such a scenario, it would be good to open a ticket with Microsoft to investigate further.