In the Advanced tab of the form properties, tick the box that says "Generate HTML for all fields." The problem occurs because the Domino server doesn't remember anything about your form until it is saved -- each time you submit it you have to send all the data. Unless you tick this option, the Domino server only creates HTML tags for the fields you can see on the screen and edit, so the values of fields on other tabs are lost. If you use the View Source option in the browser before and after making this change, you should see what I'm talking about -- there are no "INPUT" tags for those other fields.
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