I just found the culprid for that one as well!! but is not a problem with the Ixeg, is with all planes. I'm reporting right now to laminar.
Quick fix for now: Press the button for "Nosewheel steer toggle". After you press this button, everything will work fine.
The default button for that is on the left of throttle, move that switch forward and it will enabled it and it will stop shaking/moving it around.
I'm reporting to Laminar as we speak
EDIT: I found that if you remove that assignment "Nosewheel steer toggle" for button 3 "forward" and restart X-Plane, the problem is gone.