Sounds like maybe you've got damaged tables for your customer details, such as address_book, customers, customers_info, orders, and maybe more.
You'll want to compare the structure of your tables against the original Zen Cart table structure and reconcile any differences such as missing auto_increments, missing indexes, etc.
And then make sure your customers records are properly linked to your address_book records (many people break this by selectively importing just some data from some tables they guessed at having required data, instead of using their *entire* database when upgrading or changing servers, or whatever, and often resulting in similar problems.) You might also check whether the countries and zones and geo_zones tables are intact. Basically all of them :)






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