Hi,
It must be because the Shipping plugin you are using. There are many different shipping plugins for Virtuemart, and some of them has their own structure.
Try this:
open this PHP file:
/templates/flexible_coolmart/html/com_virtuemart/cart/default_pricelist.php
and look for this line:
$SelectShippingAjax = "jQuery('#selectshippingContent').load('". JRoute::_('index.php?view=cart&tmpl=component&task=edit_shipment',$this->useXHTML) ." #userForm')";
and replace it with this:
$SelectShippingAjax = "jQuery('#selectshippingContent').load('". JRoute::_('index.php?view=cart&tmpl=component&task=edit_shipment',$this->useXHTML) ."')";
it might or might not work. Let me know about the result.
Regards,
Support