Dont know why (yet), p much all cars just understeer off and requires brake/handbrake or lift-off to initiate sideways motion.
City & park drifting isn't affected as much as canyon drifting.
Been happening in my last two installations of Carbon across two different computers (Intel-based PC and AMD-based Laptop), on two different OSes (Win7 & 10), and both modded and unmodded.
