Cutting multiple embedded album covers at once

Hello, I'm new to MP3Tag and loaded several songs into the program. All of the songs show the correct album cover, but some say 1/20 (covers) or some other amount below the cover. When I put the files on a thumb drive to play in my truck, the files with one cover display correctly, but the files with 1/x play the same photo on every song that's not the correct cover. When I right click on the cover and 'cut' the cover, the number below the cover goes down one and displays the next (wrong now) cover. Is there a way to cut all of the covers at once and add the correct cover as the only one embedded in the song?

Thanks, Scott

See here for the basic check whether each file really has a cover:

See here for possible problems with the picture itself:

and finally: for best separation of the files, the following tag fields should be filled:
ALBUMARTIST, ARTIST, ALBUM, TITLE, perhaps even TRACK

For only removing the covers:

You can also replace 1 or more existing covers in one go with an action of the type "Import cover from File" when you mark "Delete existing cover art".