Hi,
You are using HikaShop 2.2.1 which have a little bug with the zone custom field.
This problem has been fixed in HikaShop 2.2.2, you can download manually this new version (which will be in the auto-update in a very few days) in the "My account > Your subscriptions" page.
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.