Wait, wait, wait... The GAME SET-UP SLIDER SETTING IS ADDITIVELY STACKING WITH IN-GAME BONUSES?
It appears so, but that's a relatively easy fix; no need to get all worked up about it.
It's not like the devs went 'oh lets make sure this game-changing setting has the effect of adding or subtracting one low-tech research building rather than increasing or decreasing the game speed through a multiplier' 
Just a wrong operator in there.