When we group songs by Album Artist and Album and we have mutiple copies of the same album, multiple different versions of the same album or two different releases (maybe a single and an album) then they will all be grouped together.
If within this grouping one of these albums have all songs matched to one MusicBrainz release, and another copy is all matched to another MusicBrainz release then the matching is probably fine and we dont want it to be considered a split album.
However, if we have multiple different versions of an album but we don’t have anything in the album field to distinguish between them then most music players will show the mutiple albums as one album, this is less then ideal so we list such cases here.
For example here it lists Guetta Blaster with 26 songs matched to two releases
and if we select the link
we can see there are in fact two copies of the album, each matched consistently to a different MusicBrainz release. So the matching is fine, but perhaps the album title of one of the albums should be modified so they are listed seperately.