no update shipment method and cart

hi
I use your plugin gk-one page to checkout , but "does not update the cart with the Shipment Method," when I turn off the plugin is the same, any ideas ? using virtuemart 2.6.10 and storeFront template
thanks to you

Hi

Please change joomla template to a default one and check it then. Let me know if it works than or not and revert it back to our template. Then tell me an url of the site also.