Delivery/shipping addresses are getting doubled up values, like "NameName". What's wrong?

SimpleCart automatically matches posted values to the address fields. If you're seeing a delivery address getting duplicated values, that is likely the result of an incorrect (implicit) matching.

Basically, SimpleCart will see a name or address field it recognises, and add it to both addresses.

To remedy this problem, use the order_ prefix on your order/billing address fields, and the shipping_ prefix on the delivery address fields.