Q: iTunes Duplicating Song Files

I am in the process of transferring my music library from a PC to my Mac Mini.  There are 13 random song files that iTunes duplicates at such a fast rate, new duplications appear as I'm trying to delete the duplicate files out of my library.  I just deleted 50+ each of these duplicated song files, and now they are duplicating again before my eyes. The deleted files do not show up in the Trash folder.  If I add an album that contains one of these duplicating files to a Playlist, the duplicated song shows up 50+ times in the Playlist.

My iOS and iTunes are the latest versions.  I have tried several times logging out of iTunes, quitting iTunes, restarted the Mac Mini, and these same 13 song files continue to duplicate.

How do I get these files to stop duplicating?!

Thanks,

PRLJM