I think I figured out what the problem is. At least in my case. I also experienced having to use quite a lot of rudder during landing.
The problem is with planes that have the front wheel steering on the ground connected to the rudder. When I land with back wheels first applying rudder also the front wheel turns so as soon as the front wheel touches the runway (like a second or two after the back wheels), it touches runway in a turned position which causes the plane to veer off the runway immediately. The only way to counter it is by applying a strong rudder in the opposite direction. I learned to do it quickly so it does not cause too much trouble to me. The way the sim works is that if the plane touches down with the front wheel turned, the sim takes that point as a calibration point so in order to even go straight I have to apply the oposite rudder until the plane stops, then the rudder centers again.
It happens especially with ultralights.
I believe it is a bug or a design choice that makes no sense.
I have T16000… nothing wrong with it. Works perfect in all sims (il2, DCS, etc.)