Why does Deployment count as a round for Gros Michel/Cavendish?

Somehow I just had extraordinarily bad luck;

I lost my Cavendish on the DEPLOYMENT stage, not even during combat. Why does Deployment even count as a round it can be lost? It was literally the Deployment on the first round I got it too. The chances of losing these are already way higher than in Balatro, so why does it seem like every possibility is in place to make them lost as often as possible?