Hello,
You have a cache issue.
I placed a product in the cart but when I went to the checkout, the checkout cart was not what I put myself.
So the page is not dynamically generated by HikaShop ; it's a cached page which is not "mine" so which contain an invalid token.
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.