Duplicated exporting progress bars and double file lists in USB drive view

Hi everyone.   Please see the attached images for my issue.   I'm getting double exporting progress bars and double file lists in USB drive view.   

Also, when I put my stick into a player it just says "LOADING" or "FORMAT DRIVE" or "NOT LOADED"

How I arrived at this issue (I think) is as follows.  

I have my music laptop which I've used for ages with rekordbox on it.    I went abroad recently and took my work laptop with me, and I transferred everything over to my work laptop in the correct way by moving he database to the work laptop.   Everything was fine with the work laptop and things were as expected. 

I got back a week ago and tried to find the tutorial on how to move the database back again but instead found one that seemed like a short cut.    >>>> https://www.youtube.com/watch?v=xHEayQ148AY&t=6s
In this one the man says do a backup from the current laptop (my work one) and then move that backup to my other one and just restore it.   Obviously move all the music files across as well.   

I then used the same USB stick I'd been using with the work laptop into the music laptop and I suddenly get the duplicated file list in the USB view and the double progress bars.    I may have seen an error about the USB not being good but can;t remember and I havent seen it since.   I've checked the actual files being exported and I don't see duplicated files on the USB stick.   But when I plug the stick into a playter I get nothing.  Just red NOT LOADED messages.  

Strangly, when I plug the USB stick into the work laptop and try the same thing I get the duplicate progress bars and file list on that laptop as well.  How can that be?  Has the USB stick passed some piece of information back to it to confuse that one as well?   
I'm really gutted as I've spent a lot of time recently working on new playlists.    Is there anyway to start fresh but keep the playlist information?

I've formatted the stick and tried again but same happens.   

Any advice appreciated.

Thanks
Graham