Sorry for the late response.
Is this happening to all your tracks or only some? What I’m seeing is that it has Tiësto in it, characters like ë can be problematic in Rekordbox where it can cause duplicates.
So on other duplicates, does the location of the track also include a character like that? Any character with an accent or something on top of it.
Can you upload your Rekordbox database file? You can find the file (master.db) here Lexicon with Rekordbox 6 write support and you can upload with this link.
I’ll respond faster next time 
Thanks!