Ghost files in mediabay


I have a problem with mediabay. I have some “ghost files” I can’t get rid of. If I perform an audio file search on e.g. ‘any attribute’ - ‘contains’ - ‘click’ I get 155 results if I set the defined browse location to ‘All media’. Some of these are not working (or don’t exist, since I can get no preview, no import and I can’t get the location shown in explorer) and if I change the defined location to ‘File system’ I only get the working sound files (72). I have tried rescanning all folders, but they keep popping up. Any ideas as to what I have done wrong and how to solve it?

Of course I can just set the defined browse location to my soundlibrary folder, but it annoys me, that these ghost files linger somewhere on my drives.