The code on the confirm part page to show the billing info:
<?php if ((isset($_POST["CheckoutWizard_submit"]) || isset($_POST["CheckoutWizard_submit_x"])) && $_SESSION['WAVT_confirmcart_Errors']=="" && !isset($_POST["forShipping"])) { ?>
needed to be updated to use the correct session from the validation:
<?php if ((isset($_POST["CheckoutWizard_submit"]) || isset($_POST["CheckoutWizard_submit_x"])) && $_SESSION['WAVT_test2scconfirmcart_Errors']=="" && !isset($_POST["forShipping"])) { ?>
I also updated the confirm page to add the tax exempt variable.