buff breaker doesn't to debuff

i used my 100pcs of buff breaker and still not debuff my enemy??? what the

Bad luck perhaps? 35% chance of debuffing your target is low but not that low to get 0/100.

I've tried it in-game. It's not hard at all. However, the thing is, it removes the buffs one by one so you gotta like press many times to remove everything.