bunch of posts all over, this is out of box issue..camera tilts and u cant stop it. apparently some fixes for steam version:
https://steamcommunity.com/sharedfiles/filedetails/?id=3352178303
but cant find any for gog version. about to giveup trying. dp fix has creater saying it might screwup ur pc so....why risk trying that if it might not even fix camera thing on ps4 controller.

fs bugged? deselect fs, save, leave settings, select fs, save, play.....jiggle alt+tab until it catches and works. afterwards it started running fs automatically without jiggling required.