jimc, I'd presume that peppe64's entry fields are following the localization setup of the O/S as far as the decimal separator is concerned.
peppe64, have you gone to the machine settings in S3D Creator (not the overrides in the FFF G-Code tab, but from the settings menu in Creator itself) and verified the entries there? I'm not on my computer with Creator right now, so I can't give the exact name of the menu. But there is a configuration window to define the characteristics of the machine that is called from one of the menus in the main S3D Creator window.
Also, please try some of the repair operations and see if there's something that needs fixed as far as non-manifold-ness, etc. 2.0.1 can do some more extensive checks, and can automatically heal some issues etc. Jimc can guide you better than I can on the settings to try in the FFF window for auto healing when generating G-code.