With an album with a single Primary Artist Link, but some of the individual tracks are performed by different artists, the “performed by” section of now playing will show the album artist as well.
An example - Twenty Five by George Michael
The first two tracks are by Wham! and are tagged as such
But when playing one of those tracks, George Michael is displayed as well
In fact George Michael is displayed before Wham!, so things like scrobbling are incorrect.
This happens on any album where some of the tracks do not have the same performer as the album artist.