Performer playing different instrument(s)/different sessions

[musoware]

You changed your source tags and re-imported? I cannot quite see on your screenshot if the performer fields have semi-colons or commas in them. In Settings / Album Collation what do you have in the Multiple Items separators field? I was assuming semi-colon only but perhaps you have a comma in here as well. If you do (and want to keep it) try changing the tag suffix to something like (ts + varitone) instead of using the comma.

[DuLac]

You are absolutely right!!! In the Album Collation I had a comma, a semi-colon and a plus sign. I guess these are the default separators that come set with muso. I do not recall fiddling with these settings ever. Maybe I added the semi-colon but I am not sure.
I removed the comma and the plus sign and all is OK now. My apologies! Thank you for your support

[musoware]

No problem!