Not sure that this is a supported module really so make your own choices as to using it. But ....
The issue for me was that in most templates the fields that the module adds are not actually in the form. So, the <inputs> are not inside the <form> . Solving that problem solved the issue.
It is in tpl_checkout_confirmation_default.php and you probably, depending on your template want to be moving the line:
Code:
echo zen_draw_form('checkout_confirmation', $form_action_url, 'post', 'id="checkout_confirmation" onsubmit="submitonce();"');
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