Relocating Missing Files on MACOS with Rekordbox

Right so I can't seem to work this one out, and I cant understand why rekordbox is so backwards with all issues...

It renamed almost 8000 tracks upon uploading ...no one from pioneer could give me an answer eventually they just left it.. 

But now Ive got over 6000 tracks missing and when  i try to find one... to then find all of them it won't let me select the track after I find it ? (as seen in pictures) 

Any advice on this ?