Hulk and Stun Synergies

So if my Hulk has an 85% chance to stun on specials, and my two BW synergies give 20 and 25% chance to stun on specials, why is my hulk not stunning on 100% of specials?







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15 x 0.25 = 3.75 The initial Black Widow synergy would get you to 88.75% chance to stun.
You now have a 11.25% chance to not stun. 11.25 x 0.20 = 2.25. Giving you a 91% chance to stun with 4 and 3 star Black Widow synergies and your Hulk.
No, you had it right
So the actual write up of this ability and synergy, and it being explained to you that this is the way it works and that it is working correctly sounds like BS to you???
And not getting a stun in such a small sample means nothing? It works, we all see it all the time. Bet you dont complain on here when you get 10 stuns in a row?