VMware NSX-T Data Center.
This issue can occur when there are database inconsistencies between sites.
To resolve this issue, you can run a fullsync on all LMs with following API:
POST https://<<LM>>/policy/api/v1/infra/full-sync-action?action=request_full_sync
If the issue persists after the full sync API has been run, please open a support request with Broadcom Support and reference this KB article.