Did you try deleting the cache?
you can edit the code directly, look for code similar to:
<?php
//WA eCart Redirect Check Out
if (isset($_POST["WA_Store_Cart_Checkout"]) || isset($_POST["WA_Store_Cart_Checkout_x"])) {
$Redirect_redirStr="checkout.php";
if ($Redirect_redirStr != "") {
if (isset($_SERVER['QUERY_STRING']) && $_SERVER['QUERY_STRING'] != "") {
if (strpos($Redirect_redirStr, "?") < 0) {
$Redirect_redirStr .= "?".$_SERVER['QUERY_STRING'];
}
else {
$Redirect_redirStr .= "&".$_SERVER['QUERY_STRING'];
}
}
$WA_Store_Cart->redirStr = $Redirect_redirStr;
}
$WA_Store_Cart->cartAction = "Checkout";
}
?>
and checge the $Redirect_redirStr="checkout.php"; to point to the confirm page.