How to prevent automatic creation of duplicate Garageband playlists on Mac when sharing songs?

When I create a song on Garageband and share it to music, it would always go to the Garageband Playlist. Then, when I would plug in my iPhone and sync. it was on my phone correcting. Well, that went away and now automatically will create Garageband, Garageband1,Garageband 2,Garageband 3,etc. The latest is up to Garageband 6.

The worst part, they are not the same songs or order on the automatically populated playlists.

I have been working with Apple for months and no-one has solved the problem. They are great and try hard. I was told my 2015 (late) IMAC Catalina 10.15.7 is no longer compatible. Obsolete! Which his disgusting as spending $2500 every 8-10 years is not cool. I have four Mac's and they all work perfect other than being out written with Apple Software Updates.

So, I just spent $1200 on a Mac Mini and guess what?...it has the same problem. I have been waiting for a response that went to Engineering but have not heard. Anybody have some intel on this? Thanks!

[Re-Titled by Moderator]