After moving on to round 56 while searching for useful Tarot cards in the Shop, the Baron was discovered without any Jokers, allowing you to find copies of existing Jokers.
Up to this point, I had bought Baron from the store when I had an existing Baron (with a bad multiplier buff) with Showman to discard and get a clean version of Baron (you can see the second Baron in the screenshot and third in the Shop).
Talking with players in the server chat, several things were suggested:
1 - Baron's appearance in the store without Showman is a bug;
2 - the existing Baron is a copy of the original version, which was sold a bit earlier and the game perceives the current Baron as NOT Baron;
3 - unlikely, but it could be the case that the Showman buff on sale remains, but I would notice on other Jokers or Tarot cards
The game is original, no mods, public_experimental version.