These are two questions.
For the first, if MusicBee says you have four albums by everyone's favourite band
Copyright Little Box At Symbol, then you probably do, whether intentionally or not.
Try
Edit > Find (or
Ctrl+F) and do a search for
Artist starts with © and see if you have any files with dodgy tag values.
Next, the
+ next to the
Artist label is MusicBee telling you that you have more than one value assigned to the various
Artist tags (
Artist, Guest Artist, Performer, Remixer) for that track.
Clicking the
... button in the Artist field will show the
Multiple Artist Splitter that lists all of the artists and their role on each track.
e.g.

Also useful is the Tag Inspector which is available from the little drop-down menu icon between the Tag Editor Save and Close buttons.

Bee excellent to each other...