Could not process payments/ webpage just refreshes..

After entering all the credit card/address info the check out page just refreshes (after clicking check out the page doesn’t display the confirmation). I only use authorize.net and using Gold Cart for WP e-commerce Version 2.9.4.
Here is the website https://www.flashpups.com/

https://www.ads-software.com/plugins/wp-e-commerce/

The problem is not resolved. The original website for this issue : https://www.ads-software.com/support/topic/could-not-process-payment-page-just-re-freshes?replies=7 …