It's not that I don't believe you. I just have no information to go on for trying to find any fix for you.
If you want developer help on the problem, then I need to know how to set up another store that works just like yours and consistently manifests the problem you describe.
So, exactly how is *your* site different from a brand new fresh clean uncustomized install of Zen Cart?
Including, but not limited to, product types, attributes assigned to the purchased products, product settings, tax settings, shipping settings, payment settings, all admin settings, currencies, languages, addons, .htaccess changes, customizations made, and the list goes on. Oh, and your PayPal account settings too ... how do yours differ from the posted instructions here:
http://www.zen-cart.com/wiki/index.php/PayPal
If that list can be used to create a new store that consistently replicates the problem you describe, then something more can be done to fix the issue.
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