So I just took all of my displayed armor off of my manequins with the fear of losing them (since they're so damn glitchy). I left Severin Manor and came back in to find that some armor pieces were still on display. After checking my chest for the pieces that I had recently stored, I was able to confirm that these were, in fact, duplicates and not the same pieces. For example, I now have two pairs of Miraak's gloves and boots

Has this been brought up or discussed before?
EDIT: There is meant to be a "/" between Double and Multiply in the title.