Z-Axis not responding

What causes the Z-Axis to move up and then down while pushing the down key in Easel? I cannot get it to zero on my material.

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I guess I did not word the question correctly. I’ll try again… Something must be wrong with my controller because when I push the down arrow (or up arrow) in Easel the Z-Axes will move up a short distance then move down a short distance move up a short distance then down a short distance (you get where I am going with this). Any one no what’s going on with my controller or Z-Axes?