I recently noticed that when I draw a box of 100x100 mm, the marked dimension of this box is 100.7 (X) x 101,3 (Y) mm. By changing the (calculated) scale in the field configuration parameters, I was able to get the marked X to exactly 100 mm but Y is still 101.3 mm. How come? I suppose this scale setting is only for X, is there another parameter setting for Y. I couldn't find it, not in EzCad and not in the manual. Or is it actually a hardware issue, aligning of the mirrors or lens or something like that?

BTW, it's a Rayfine 30W laser.