Hi Rhino,
this is not at all what you shoudl be seeing. I think there is a way to "switch" off the nosegear steering in X-Plane though...make sure that you do not have a switch set to that accidentially (like on a hardware throttle with switches).
The rudder pedals are linked to the nosewheel like in the real plane - with the exception that at slow speeds, you can deflect the nosewheel a lot further than the nominal 7 degrees. This is a simulator concession, because few people have the option to assign and use a second axis as a "tiller".
That being said, the next update will include the tiller to be able to manipulated with the mouse (or a second axis or the VR controller) so you can taxi around using that instead of the rudder pedals.
Let me know if this helps!?
Cheers, Jan