Hoping for some guidance, not sure how to troubleshoot or where my problem lies.

I run a 2WD and a 4WD buggy on a 4PX, they have Reedy 1206 and 1408 servos in them. When I twist my transmitter steering wheel and release, the servos never really return to full center. I've tried them on digital and analog settings and neither setting corrects the problem.

Any ideas on what the issue might be? Any help would be greatly appreciated, thank you.