First, you have set Universal Email, the Store order sumary and the store order details options to all redirect to the checkout success, remove the redirect from those three, they should not be set to redirect.
There is most likely a php error occurring that is preventing the redirect.
Add the following to line 1 of you page to turn error reporting on:
<?php
error_reporting(E_ALL);
ini_set('display_errors','on');
?>