Welcome to the forum, wombleywoo.
I have not experienced your curious situation in my several years running MusicBee, which I am still learning. I currently have at least three pairs of identically named albums: "Alone Together," "The Four Seasons", and "So What"; plus, like many of us, several called "Greatest Hits". (All these are single-disc albums, FWIW.) I don't have "grouping" of any tracks with Artist tags being different in each set/case. I've even had identical albums ripped in different encodings (MP3 and FLAC) that still show separately/individually in the respective artist folder/MB listings. All of these groupings also show albums separately in Windows Explorer folders, BTW, which is what MB is reading. My MB views are Album Artist in the left panel and Album Covers in the main panel; my sort is also Date Added/Album.
Best of luck figuring this one out soon, which you should. Have you tried re-ripping the pair of Form & Beauty, perhaps re-starting in between (even though this should not be necessary nor make a difference)? Any chance that a prior/other music managing program/application may be interfering/doing its own thing?