InfoPath Dev

I have an InfoPath 2010 Web form.  One of the fields, setup as Person or Group, is being set via the username() function. The user information appears in the form as expected.  When the form is submitted, the data is not appearing on the sharepoint list.  If I go back to the form and manually enter the user information into the field, the data comes over to the sharepoint list.  How can I force the data to populate without re-entering in the data.  Thanks!

Make sure you are setting the AccountID field in the people picker field.  I would also recommend setting the field via form load rules instead of default value.  Hope this helps!