Are the Console masteries now in line with the PC/mobile ones? Masteries used to be asymptotic at 100% (meaning they’d slow down as you got more points and you’d never be able to reach 100%). They were changed for PC/mobile to become asymptotic at 73% in 1.0.8:
If this just hit consoles then you might additionally be feeling this loss. (To be fair, it affects your opponent as well, so it’s probably a wash.)