MC doesn't randomly add Cover Art to Albums incorrectly, although some people with strange workflows have seen some issues. Not with Audio usually though.
First just try to Rebuild Thumbnails. The Cover Art may be correct but MC mostly shows thumbnails that it generates from the Cover Art, and sometimes those can get messed up.
Check the actual Cover Art files if they are separate, or look in the files using Windows Explorer if they are embedded, to see if they are wrong there.
MC's COver Art lookup for Audio works well for Albums, but not so well for individual files, even if you are doing them on mass. So best to try other things first.
The Options settings has a search bar at the bottom.
The Wiki has a Cover Art article.
You can search the forum using the search button near the top left of the forum, or using Google via the link under the Support menu at the top of this web page.