Search tracks on USB not found but the are in Rekordbox

Hi There

when I export al my folders from rekordbox too USB stick (3.0 sandisk) al went ok!

but when I am dj ing I use CDJ 2000 Nexus wen I search a song that I want too use sometimes I can't find them when I search on usb using CDJ 2000 Nexus

but when ik look in my rekordbox on computer track is in it! what is going rong? I don't get any export error 

I use Rekordbox 5 and newest firmware on Cdj 2000 nexus player

and I also format mij 128 GB USB 3.0 stick again on OSX I use

mac osx journaled 

It works great but some tracks I can t find when using Search

Anny HELP?