The ISRCs with multiple recordings report has one problem: There are lots of DEF05 ISRCs (Deutsche Grammophon, iirc) that link to multiple recordings which we can't do anything about because in this case the label decided to assign the ISRC to all tracks of a release. There might be other labels which did the same, but that's the one I know of.

The report should either be sorted by ISRC so you can just skip them or the DEF05 ISRCs should be hidden altogether because right now one has to constantly skip pages to reach ISRCs that are really problematic.