Hello,
Do you have some view overrides ?
I cannot see the javascript for the HikaShop cart module ; so it cannot refresh its content automatically (when using the new cart system).
More than that, I can see in the product page that the "add to cart" is still in legacy mode.
So it looks like you got several overrides which affects the store behavior.
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.