I have no idea as to what machine you have but is it possible your cutting grates are worn, assuming this is a flat machine? If so put some hoops of banding on the table to lift the material.
I don't know if you got this figured out yet, it is the grid shift. You have to change the parameter 1850 Z.
What has happened is the head has crashed at some point, and the coupling between the servo and the screw has slipped. It is designed to do this. Because it slipped, the position of the z axis has shifted up just a bit.
Thats looks easy enough for me. I usually getting alarm when Z is -0.06
HS-98 suppose to work with minimum 20 gage materials. But I'm cutting 24 gage.Thats a problem.