Radio Button / Check boxes all checked when flattening. Please help!

Hi!

I have created a couple of forms that include 2 linked check boxes / radio buttons. I set the buttons over "AM / PM" and would like only one checked at a time. When I fill in the form the check boxes work perfectly. However, when I try to flatten the form it automatically checks all of the check boxes. I can not figure out how to flatten the form leaving only one of the options checked "AM" or "PM". I do not want both boxes checked upon flattening. Only the one that was selected when the form is being filled out.

Is there a setting that would fix this? Maybe in the flattening parameters? I cant figure it out.

Please help!