Just encountered this glitch where I would head to the Carpenter work bench and things i have created will reappear on the list. No changes would be done to the room and you would waste materials. Such examples is the bookshelf room. Seems like Bethesda did a piss poor job on this dlc.
this needs to be patched in the next update. I keep exiting and re-entering, sometimes I'm lucky and 2-3 times it will return to normal over 10 times I say **** it! Good job on skipping the quality control there Bethesda.
I can confirm I have this bug as well I just reported it in the bug thread.
Also I can add to this if you construct several things let's say two end tables and a dresser. Ok I make the two end tables and the dresser disappears and if I exit the work bench and click it again the dresser will be back.