I've been analyzing volume for various tracks, but the "and; (Album artist)" has not repeated.
In two tracks, the "and" appeared without the "; (Album artist)", the "(Album artist)" was there before the analysis. Here the screenshots of one track:
I've noticed that in the tag inspector, after erasing the "and", writing the "(Album artist)" and saving -if I remember correctly-, the tag that appears as "and" still there, I erased it.
Searching in another artist which had the problem with serious tracks, I found the "and" in the tag inspector, but in this case the tag was "and; (Album artist)" and I just erase the "and; " from the tags. Here the screenshot:
Thanks and sorry for my english mistakes.