1) On the confirm page, the expedited form element is not a part of the form. it needs to be moved so it is after the following form tag:
<form name="ecart_checkout_form" action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post">
right now, it is before.
2) the trigger for the set session value behavior is set to before page load.
for the trigger, you should click the lightning bolt and select the expiated form element.