Should Nikon 2X EER Reticle Move When Viewing Eye Moves

I have a Nikon 2X EER scope on a rifle, in Scout confguration.
With the rifle held steady, I notice that the reticle point of aim changes if I move my head.
Is this typical of EER scopes, or is there a scope problem.
If typical, is it common to all the EER scopes including Leupold?
Bob Nisbet