Hi,
Thanks.
It looks like you have a redirection while submitting the form.
But if we use the link in the checkout bar in order to go in the next step ; it's working.
Regarding the code, I don't see what part of the checkout controller could produce this redirection.
Could you please provide a backend access to your website and also a FTP access ; so we will be able to check your configuration directly and fix the issue.
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.