I came across this release group
As you can see from the originating bandcamp, it's a label bandcamp, but it's not an "official" label bandcamp. It's just a regular artist bandcamp leveraged by a label. This is very common, because it cost money to open a label bandcamp.
Thus the artist field on those bandcamp pages has the label name. Hence the entry is wrong in musicbrainz. (see edit history if your seeing this issue in 7 days from it is posted)
Cool tool though! thanks for making it!