Hi,
With HikaShop you have a feature for "multiple cart" ; it allows the customer to name his carts (like you can put names on the wishlists).
But by default there is no name for the default cart (which is created automatically when the customer want to add a product).
No data missing, no bug ; just that your customer did not put a name for their carts in the user cart listing.
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.