selected radio button, on resubmit, not set according to FireFox

[dmmh]

Im using back buttons wth hidden fields to post forward and backwards the stuff in my forms
I use PHP to evaluate if something has been set and if so, want the HTML be similar; eg: radio buttons are pre-selected upon going back through the forms.

This works fine.
However, form validation fails because the radio button, according to Firefox, isnt set...even though it really is selected...forcing me to go back another step, because now form validation will fail recursively.
How come it doesnt take along the value?
Even though its selected?

If I click on it with the mouse again, ofcourse it works fine....

[dmmh]

cmon....