XDJ700 x E-8305 brand new wavs

I just bought a bunch of wavs from bandcamp and some work on my XDJ's and some don't - super weird

For the ones that don't work I've tried:

- Exporting as different bitrate wavs

- Exporting as AIFF's

- Re-downloading the wavs

- Latest version of Rekordbox

- Old version of Rekordbox

I bought the XDJ's only a few weeks ago and have bought and used wavs from beatport and hard wax with no problem

Any help?! It's driving me nuts.