Rekordbox 5.4.1 Import Problem

HELP!!!

So I've recently updated to the latest Rekordbox version 5.4.1 and I've since encountered a very annoying problem.  Now, when I drag and drop music files from my USB into my 'device' within Rekordbox to be analysed, it creates a duplicate music file in the very same folder on my USB!  I've used Rekordbox for about 4 years now and I always transfer my music to Recordbox using this method, and I've never had this issue before (or any other issue for that matter).  Surely this must be a glitch with this new update/version?

Any help would be much appreciated as it's driving me mad!

Many thanks in advance,

Andy