Hi,
Are you sure that nothing happened ?
I made a test on your website and the credit cart plugin seems to work normally.
The first time the customer submit the form with the credit cart details, it refresh the checkout to the same page in order to display the confirmation ; the credit cart details are no more editable so the user can check once more and validate to confirm the order.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.