So, that was the first time in BAJ's Alchemists history that both following conditions were verified :
- Every theory is either full (3 seals) or in conflict
- One player has no seal on every full theory and has got at least 4 gold
So the engine did think that he (you) was still able to confirm with a 4th seal... but the GUI is much more clever
Well, it is now fixed, and I renounced for you, and it renounced automatically for everyone.
Thanks for reporting !