Are your scope rings too tight that they are deforming the scope tube and impeding movement of the inner tube? Are the rings at slightly different heights and bending the scope tube as that will also impede movement?
Take the scope out of the rings and place it in a V-notched box so the scope is stationary. While looking through the scope, aim at something about 25 - 50 yds away, and turn the adjustments to check for movement.