WindowXML – distortion with different main skin

Hey guys, I have a weird problem, for which I do not have any clue where it comes from..
I have written an addon using the WindowXML class, which looks like this, if I have the standard Estuary Skin active:

and like this if the estuary mod is active:

and like this if arctic zephyr is active:

look at the controls at the bottom.. they get distorted or completely messed up..
you can check my code here: https://github.com/NicolasHaeffner/plugi…ectcontrol

(BTW I know where the issue with the labels comes from.. I use the font definitions of the current skin, but that should not mess with the controls right?)

I have no idea why this happens, and would be glad if somebody could help me..

EDIT: okay I solved the issue with the distortion in the estuary mod (for a group of controls I did only define the with in the group itself and not in every control) but the issue with arctic persists..