Duplicated songs on XDJ-RX3 but not in Rekordbox

Hi,

My Pioneer XDJ-RX3 displays some duplicates that don’t exist in Rekordbox.

Example : in Rekordbox, I see that I have 1 track.
On my Pioneer XDJ-RX3, said track appears duplicated (2 to 5 times).
This problem doesn't happen to every track.

At first, it seemed that the amount of duplicates was representing the number of playlists in which the track appears. So if the song was in 4 playlists in Rekordbox, the track would be duplicated 4 times on the Pioneer DJ.

I tried using another USB stick and syncing from scratch, but the problem is still there. Actually it seems that it has reduced the amount of duplicates (now I get 1 to 3 duplicates instead of 2 to 5). So now, the amount of duplicates doesn't represent the number of playlist in which it appears anymore.

Does anybody understand where this problem come from?

Thanks!

Regards,