Sync wants to delete entries in AADUserHasSubSku with xorigin = 16 but can't

Hi

Our customer had many changes on their licenses so the sync is trying to delete some entries in the AADUserHasSubSku table. Although the synchronisation log doesn't state errors it's obvious that system isn't deleting the concerned entries. Day after day the log shows that it should delete many entries but ultimately it doesn't - they are still there. Evenmore, the count of the delete operations are basically every day the same. 

I tried to delete one entry by myself. That also didn't work. Furthermore, all entries have bascially xorigin = 16. That might be the problem. Some allocation between User and Group on the AADUserInGroup table do still exist when I compare the same allocations in the AADUserHasSubSku table.

Azure is the master so the changes made in Azure should be enforced in OneID. We are currently on Version 8.2.1.

What can I do to make the the sync work properly?

Thanks for your help.