Solved XXL Control different z axis heights

I am using the XXL control on both 3D printers, not really an issue or problem that I am finding, But the thing that has me confused, before every print, I auto home from the controller. When I do the z axis setting is always different for every print. Even if it is the same print from the sd card (I store the gcodes on the sd card and just print from there). I get pretty decent prints, but sometimes the print may be a little light on the first layer. I set the z offset in the gcode before I saved it on the sd card, but the z axis number is different for every print. Should the z offset that I set in the gcode , be the same as the sd card z axis? For example, the zoffset in the gcode is set to .5, but the sd card z axis reading for the first layer is .9, sometimes 1.04, sometimes .59 etc...

 

Should I not auto home it every time then?

 

They do read 0 after homing, but when it starts to print is when the reading changes

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