About a month ago, I moved all my music files using Rename, Move, & Copy file in MC28.
There was a glitch on one of the moves (I only did groups at a time in case something happened).
After the move there were a large number of duplicate files listed with the exact same path (the new drive).
I was able to figure out which listing was not needed by seeing which ones had playlists attached and other data and then grouping them. Removed these files and everything basically works because I have selected "Ignore files previously removed from library" in auto-import. These duplicates do NOT actually exist when you look in "Windows File Explorer". There is only one file there in each instance. Only MC28 sees the dupe for some reason. Auto-import still sees them each time it's run, yet keeps only the file active that I didn't "faux" eliminate.
Why does MC28 think there are two of these files and still finds two of these files? Everything's working fine as far as the actual library because it's ignoring the faux files. But auto-import still thinks they are there and somehow ignores the ones I eliminated.