Removing duplicates from a playlist.

Hey there friend. Below are the steps I found to fix this issue. I also provided the link where I found it so you can find a little more details if you need. Hopefully this helps. ;)

Find duplicate items in Music on Mac

You can find every instance of a song by the same artist anywhere in your music library. For example, the same song could appear on the artist’s album and on a movie soundtrack.

You can also search for exact duplicates, in which a song, artist, album, and version are all the same (if, for example, you inadvertently imported a song twice).

1. In the Music app  on your Mac, click Songs in the sidebar on the left.
2. Select an item, then do one of the following:

• • Find every instance of that item in your library: Choose File > Library > Show Duplicate Items.
  • Find exact duplicates: Hold down the Option key, then choose File > Library > Show Exact Duplicate Items.

https://support.apple.com/guide/music/find-duplicate-items-mus4a9a2d6f1/mac

My apologies. I understand what you’re saying now. I actually had almost the same exact issue last year. But it was with my iPhone. it displayed multiple duplicates of an Eminem song.

so, I deleted the one that showed up in the search. Which in turn deleted the duplicate. I then Close the app and re-launched it. I’ve been searching through my playlist, and the duplicates were gone.