Brew Efficiency II not deducting

Okay, so I raised this issue in the in game help bar and the person was useless. Ugrading BE II from 11 to 12 should take Level 6 monsters from 60 per hit to 59, but it does not.

My clanmate has BE II at 10, and they require 61 to hit level 6.
BE II at 11 requires 60.
BE II at 12 also requires 60 with an apparant extra 2% taken off.

 

It's normally been consistent, but it begs the question, if this is wrong, what else is wrong when it comes to their calculations and implementation of the research boosts? I'm not sure ATA even care, but the fact gets so expensive and lengthy to upgrade and you may or may not get the actual effect of the research is concerning.