Mazak Mazatrol T2 controller question

I just got a Mazak QT10N with Mazatrol T2 controller. I'm having trouble to set the Z work offset. I'm touching the face of the part with tool number 1 and Z zero on the page that suppose to be and with the Z showing zero on the command page. The problem is, when I put to AUTO operation, the Z offset shifts from Zero to other number. I noticed the only way I can get the Z work offset with zero in AUTO operation, it's if I set the Z-offset of the tool 1 on that position. However I lose Z offset of the other tools.

Has anyone experienced same problem?

Thanks