There are some games that get mistaken for another one. In this case my “Destruction Derby” image gets somehow mixed together with my “Destruction Derby 2” image, they even get a Hasheous match for whatever reason.

This is how it looks during the scan:

And this when you access it in the library:

AFAICT, manual matching only allows me to match both disks to the same game again. So I could either match both to DD1 or both to DD2, but not seperated how it’s actually supposed to be.

Edit: Never mind, I should have been more courageous with my attempts to fix it. Manual matching indeed worked.