Hi,
Your cart is working good. I guess you have broke something in your user session.
Or maybe your tried to add an entry and you didn't empty your cart.
Tried to logout and re-login. You can also go in the HikaShop user control panel and access to your cart to empty it.
Cleaning your browser cookies could help too.
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.