Now I could be wrong this is just my experience and trying to give my 2 cents. No then that is not normal the joints will bind up. The adjustable joint has turned in the arm most likely the jamb nut is not tight enough. Seems like after the first adjustment and driving for a while you have to go Back and retorque the jamb nuts or the joints will move. Loosen the jamb nut, align the joints, (they don't have to be in the middle actually easier if both to one side) and retorque the jamb nut.