Hi,
Like that, I'm not able to have any clue about the issue ; but I suppose that it comes from your template or some kind of security plugin.
I'll need to see the problem directly in your website.
You can use the "contact us" form to send us such kind of private information (with a link to that forum thread so the support team will be able to assign me the ticket).
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.