Reread your post and found my original understanding was incorrect. This is about when one metric has more targets than from A to Y. Don't have the ability to test that. If after installing the 20.3.3 June update this still happens open a support case.
available at:
CA Unified Infrastructure Management Hotfix Index
https://support.broadcom.com/external/content/release-announcements/CA-Unified-Infrastructure-Management-Hotfix-Index/7233
note the site was changed, to download it is now necessary to client Login at the upper right corner.