New Kioti - shudder after turning?

I just got my first tractor (a CS) and took it out for the first time yesterday. I’m new at it and still learning the controls, haven’t driven a diesel before. I noticed that after straightening out following a sharp turn it would shudder a little forward and backward.

I was using the belly mower at the time, but it also happened if I didn’t have the PTO engaged. Running in low gear on fairly level ground. The RPM seemed to be at the correct spot and the pedal wasn’t on the floor. Since I’m new I’m still a little ginger with it overall so I mostly wasn’t running the speed all the way up, but I tried adjusting that and it didn’t seem to have much impact. The shuddering would stop when I restarted after I laid off the pedal altogether and straightened out the wheels.

I’m assuming this is user error of some kind, but I can’t figure out what category of adjustment I need to make. Any ideas?