Before I added Scarecrow to my collection, I had 1 John Mellencamp album. After I added Scarecrow I now have 3 albums under the artist name even though only 2 albums show when you click on John Mellencamp. If I unmatch Scarecrow so that it’s unidentified, I have the proper 2 albums.
The issue here is that AllMusic has credited the album to two people we consider to be equivalent. I’m not inclined to fix the equivalence here either, since John Mellencamp and John Cougar Mellencamp are the same person. We just need to do better handling these cases.
I’m going to open a ticket on this and discuss with the team. Thanks for the report – we’ll get this fixed @DrTone.