Calibration guide for laser


I’m having a hard time callibrating the laser. I have been running the calibration guide four times in a row, and even thoug I choose “-5mm” each time the laser height remains the same and the laser guide outcomes as well look identical.

Right now my laser height is around 20-22 mm for material that is 1,7mm ±0,2mm. It is not a disaster and will properly work but I don’t understand why the calibrations dosent change the laser hight?

What am I missing?