Gamble counter doesn't increment when a boss is killed.

Known conditions:|
1. Chapter 2. Risu gambler.
2. Gamble counter is < 100. (36 in my case)
3. After multiple kills (3 times) of the same boss (Chapter 2. 16 lvl locations boss) gamble counter is not increased. (I play hardcore so I am forced to farm safe boss for gambling).

P.S. Still I don't understand why we need this gamble counter. If i'm unlucky with my current farm I can at least game. But I'm forced to farm low lvl boss to get a CHANCE to gamble. Why?

And yes this bug if floating. It doesn't always repeat.