I recently finished the 20 present quest to get my 2 carat ring. Also note that I did not get it last year (I picked the game up late and couldn't get all 20 in time). This was my 21st run, but whenever I try and trade in the gift, it brings up the prompt to trade in my ring for a random chair and I'm too afraid of saying yes because I kind of need the ring. EDIT: File attached. Let me know if you need a better screenshot. I tried to get the present, ring, and message in the same photo.
You cannot get another ring if you already own one, which is why you are getting the prompt for a chair. However, we will look into making the details at the NPC a bit more clear.
Does this mean that I cannot continue to kill the slime? I'm trying to turn in a present that I received after the 20.