I think this is probably my fault from submitting issues to CLZ.
I just noticed that I had copies of the trade dress and virgin cover of Mark Brooks’ Rogue cover in both X-Men Volume 4 and X-Men Volume 5. I checked my CLZ database and the issues were listed in both volumes. I checked all 4 issues and they all belong in X-Men Vol 4 from 2020. I checked the CLZ core and these issues are listed in both Vol 4 and Vol 5 and that is not good.
THE FIX:
X-Men Vol 5 #12H and #12I should be removed from Core. Any other users that have issues linked to X-Men Vol 5 #12H and #12I should get them automatically converted to X-Men Vol 4 #12D and #12E.