Gamble stock limit.

My gamble stock limit is at 0/100
it says to gain stock i need to kill unique monsters.
i killed act bosses aswel as area bosses, but my stock is remaining at 0/100

Either im missunderstanding something here or its bugged out.
anyone have more info on this?

I can confirm this bug;

I specifically killed A1 witch 5 times at 0/100 and received no gamble points. Will attempt a few things and update on findings.

Update:

It seems that it may be act specific. Can you confirm?

Same Problem here. Risu remains at 0/100 Stock, no matter what is do or kill...