There is a known issue mentioned on numinix forum where Gift certificates do not update the total after you hit refresh until you get to the confirmation page (which is a problem if you turn on the one page checkout). It just took me many hours to crack this one, but i finally figured it out. Here's the solution:
modify file: /store/includes/modules/order_total/ot_gv.php
comment out line 167 (as shown below):
Code:
function collect_posts() {
global $db, $currencies, $messageStack;
// if (!$_POST['cot_gv']) $_SESSION['cot_gv'] = '0.00';
if ($_POST['gv_redeem_code']) {
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