The shaft on the right front burner control is defective. The know just floats on the shaft and can be put on the shaft in 2 positions. If you take that knob and put it on any of the other shafts, it slides on tight and does not wobble or float. If you take all 4 of the remaining knobs and try them on the right front control, they all wobble and float and will fit on upright or rotated 180 degrees. The shaft of that control is smaller or incorrectly grooved.

Also: when the Hot Surface light goes out, the burner or burners used are still way too hot to the touch !!!