Address field Label + template member grouped, address bloc always at first

Hi,

I noticed something "strange" in Isotope.
In the shop config, i checked fields i wanted (firstname, lastname, ... and label) so i can give a name to the address. whatever is the label field position, if i choose to display the address form with the member grouped template, the address group is displayed first.
it's messing up my Form :)
I'd like to keep the group order : personnal >address >contact > login >profile
Did i miss something or is it really a "bug" ?