[scott967]

Did you look at the "extended tag info" in mp3tag (I think also might show up on the "classification" tab in MediaMonkey)? For example, for MP3 files tagged with ID3v2.3, Kodi normally will get the artist and album artist from the standard ID3 tags TPE1 and TPE2. But it is also possible to create an extended tag which in ID3 is stored as a TXXX tag. Kodi will recognize ALBUM ARTIST or ALBUMARTIST in these extended tags and I haven't tested, but guess that the contents of these tags if they exist are added to (or maybe replace) what is found in the "standard" tags. If you had put in, say a "sort order" in that extended tag with "Beatles, The" that might explain it.

scott s.
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