make the same change on the cart page to the code that performs the redirect:
<?php
// WA eCart Redirect
if ($eCart1->redirStr != "") {
header("Location: ".$eCart1->redirStr);
}
?>
to:
<?php
// WA eCart Redirect
if ($eCart1->redirStr != "") {
session_commit();
header("Location: ".$eCart1->redirStr);
exit();
}
?>