NSX 4.2.2.1
In NSX 4.2.2, the number of certificates has been reduced, and as part of the NSX upgrade process, some certificates were intentionally marked as "orphaned."
This is expected behavior. To address the issue, delete the certificates that show a value of 0 in the "Used By" column.
Note: If the "Used By" field on a certificate is greater than zero, it indicates that the certificate is still associated with one or more components in the NSX environment. Such certificates should not be deleted.
Also refer to KB: Unused Expired NSX Certificates
If the steps outlined in this KB do not resolve the issue, please raise a support ticket with Broadcom Support, selecting NSX as the product.
Handling Log Bundles for offline review with Broadcom support.