This is the weirdest glitch I've ever seen. Though there were two of the item in my wardrobe, they acted like one item- clicking one would make both show as 'equipped' and clicking it again unequipped both. Clicking the 'remove one' button on Account Search resulted in one item being moved from wardrobe to inventory and the other item being removed from my wardrobe and disappearing, but I'm not actually sure if I had three to begin with or if I only had two and the wardrobe made an illusory 'clone' of it somehow. (I put it/them in there by way of quick stock, and before that I had given a lot of pies to Charity, so I didn't really keep track of how many carpets were in my inventory. Either way I don't especially mind if one did disappear, I just thought it was weird.)

Putting it back in my wardrobe directly from my inventory seems to have solved the issue and now I correctly have just one in wardrobe and one in inventory, but I thought the staff might want to know that was a thing that could happen (and possibly eat items)

Same thing happened to me, I have two white smoke wisps in my wardrobe o.o

I had a few items do this to me too after I quickstocked the new Fireside items. Most strangely was in my collections, Blue Wreathed Fiery Red Rreign Beanbag and Brown Wreathed Fiery Red Rreign Beanbag say I have '2 found in your beanbag collection' on the account search page. However, only one of each item is shown in my collection.