In the last two months or so, I’ve had a number of instances where running a kerb has left me with a constant pulling force to one side or the other after returning to the track. This has occurred with several track/car combinations (most recently the official GT3 cars at Portimao and Mugello) and does not relate to car damage. All assists are turned off (it’s not ‘steering help’...) In all cases, pressing the in-game FFB reset button has restored the forces to normal. Kerb ‘strikes’ do not even need to be violent - this issue has occurred even at tracks such as Mugello where the kerbs are suitable for bikes. My wheel is a Simucube 2 Pro. Simucube support (Mika) has confirmed that there is nothing in the Simucube True Drive settings or profiles that could account for this behaviour and that the in-game FFB reset would not be effective for a wheel-side fault anyway.
Try this: Put this Json in your \rFactor 2\UserData\Controller folder. Open Rf2. go to options>controls and click load. Find 'SC2 SEAT Fix' and click accept.