Error when exporting tracks using windows 10

Hi, I use rekordbox 6.5.2 with windows 10 to build my music library to play on my xdj rx.
this weekend I went to make an update in the library and
several songs didn't export to my usb drive.
I formatted the drive and tried to export again and
once again it was missing several songs,
and the funniest part, this time there were other songs.
that is, it is some error. how do i fix it?