I can confirm the same behavior as JackFlash. Game Flight mode is not enabled. Key bindings are not double bound. Axis tuning is correct, deadzones accounted for and curves set etc. I have Auto Rudder unchecked and Landing Assistance set to 0. Verified server is not forcing game mode.
Simply taxing around I see the rudder moving on it's own as if it is trying to keep my taxiing straight. Taxi up to 10 knots then push the stick forward to unlock the tail wheel. You will see the rudder move on its own to the left as it tries to keep you straight.
Go to extrenal view: taxiing straght ahead, I go full right deflection on rudders then ease off the rudders. Before I get back to the neutral position I can see my rudder swings to the left as it compensates.
Also, a some speed, my rudder authority is being limited. From external view: from a dead stop with full rudder deflection, I slowly increase taxi speed and I've noticed that at some speed (between 7 and 10 knots) the rudder will snap back from full deflection to some intermediate position. Above that speed I can no longer see full deflection on my rudder. Bringing up the Controls Indicator (Rctrl+Enter) I see the rudder input bar is grayed out at the edges (this indicates the toe-brake axis I believe). Below a certain speed the rudder will indicate to the far edge of the input bar but above a certain speed the rudder snaps back into the red bar area (see screenshots).
Screenshots of Rudder Deflection Behavior: https://imgur.com/a/zVncM18
I see no noticeable change in behavior with different combinations of Auto Rudder and Takeoff Assistance enabled/disabled. It seems like enabling or disabling those options has no effect.
