Generally the steering wheel and shaft have alignment marks to keep the steering wheel and linkage centered with respect to the centered pitman arm position. You can pop the cover to see, but my guess is the marks are aligned. The issue described is usually the result of an alignment where the steering wheel is slightly off center during the procedure. The means of adjusting steering wheel center back to the center of the linkage is by the use of tie rod adjustment. The total distance between the tie rod ends remains constant as they are adjusted one way or another to correct the wheel center with respect to the linkage center. I have been unlucky with this issue far too many times after an alignment. The solution was never to correct the wheel placement on the shaft, but to center the wheel and shaft with the center of the linkage by tie rod adjustment.