Moze suddenly runs 2 times faster

i have played like 60 hours. today moze suddenly started to run a lot faster.
back to main menu, and reload game fixes it temporarily.
i dont know whats triggering it.
moze is the only char i played so far. until today i had no problem.
i play with ingame vsync enabled and no fps limit set. if i activate the fps counter i see 60 fps all the time.

i just noticed i use a shield that boosts run speed (10%)

doesnt feel like it’s 10%. and like in said i dont experience a consistent boost.

pc specification: gtx 1070, i74790k, 16gb ram @2400, samsung ssd