Hi,
To handle the zones in HikaShop, there are two tables in the database:
- hikashop_zone which stores the information of each zone
- hikashop_zone_link which stores the links between the parent zones and the subzones.
If you have blank lines, it means that there is an entry in hikashop_zone_link pointing to a zone that has been deleted in hikashop_zone.
I would recommend to delete these two tables, install again the install package of HikaShop 4.0.2 and that will put back all the zones as they were by default. Then, add the zones that you need (if any), relink the zones in the "zone" setting of your tax rules, payment methods, shipping methods, discounts, coupons if you set any and you should be good to go again.