BGP Neighbor IPs are still showing though they were removed from the router

We have a Cisco ASR1002-X device being monitored in Solarwinds. We had alerts for BGP neighbor down. When checked with network team, they confirmed that those were removed from the router.

But still we see them in Solarwinds and alerts are not getting cleared automatically. I have done Re-discover and Poll Now. Found 3 interfaces were in unknown status (related to them), removed them as well.

Still same issue.

BGP Router neighbor issue.JPG

How to get rid of them from Solawrinds monitoring? From where we can remove them, so that they won't show up and reflect in the alerts?