Hi, I will try resetting HUB see if that resolves matters but for now I have just stopped looking at ALL local storage as suggested in another reply below.
if you only see it once when selecting internal drive only but duplicated when selecting all internal drives[which includes external USB drives] it sounds like you have the movie twice. once on the internal drive and once on one of the USB drives.
Try checking the internal drive from your PC, then plug the USB drives into your PC directly and see if the same movie is there.