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So weirdly, Plex keeps adding artists to individual songs on albums, and I can’t figure out why. The info isn’t coming from the mp3 itself. How would this be happening? Doesn’t make any sense. Example shown, where there are random extra artists on some of the tracks on this Heather Findlay album.
Do you have “Prefer local metadata” checked in the properties of your music library? (Don’t change it yet!)
Which album is this?
I can’t find that setting anywhere…?
This is “Wild White Horses” from Heather Findlay. None of those folks came anywhere near this record. 
https://blacksandrecords.bandcamp.com/album/wild-white-horses
It’s in the properties of your music library, on the Advanced tab. https://support.plex.tv/hc/en-us/articles/200289266-Editing-Libraries
Did you inspect all the embedded meta tags with a dedicated metadata editor?
Just looking at the file properties in Windows file explorer won’t show you all.
Try mp3tag for this.
