So you want it to appear like this?
Where under the title it lists either the multiple split out artist / guest artist etc and if none are there just the plain artist tag.
Make the most basic Virtual Tag: MB> Edit> Preferences> Tags (1)> Define New Tags
Name one of them something, for example I did "PlainTitle" type in there <Title>
Open the display section again
But this time change the top field to your new virtual tag [PlainTitle by example] then choose Artists for the next field, that should do what you want.
[Update/Explanation] You were right to point out that it only happens when the <Artist> tag didn't match the <Album Artist>, by default the title detects the mismatch and displays it, the virtual tag we made get's rid of that function and just displays the track name, thus getting rid of your duplicates. Only dug deeper into some of this stuff a couple of days ago.