Two more possible causes to check:
1)
ALBUM ARTIST has multiple values, with the tag being repeated for each value, such as:
* ALBUM ARTIST: Various artists
* ALBUM ARTIST: Various
If this is the case, you will be able to see it with mp3tag and its tag inspector (Alt+T).
(I don't know what tag inspector is shown in the screenshots.)
I'm much less familiar with kid3 and Tagscan, also mentioned by Phaedrus.
2)
* For ALBUM ARTIST, some tracks of 'Electronic Evocations...' have 'Various artists', while others have 'Various'.
* In MB's preferences, what defines an album is its name only. (See: Preferences -> Sorting/Grouping -> grouping.)