can you send a copy of your page and the webassist/email folder so i can examine the code to see what is wrong.
when you apply the wizard, server behaviors for upload and the email are added to the page.
Since it is possible to have more than one instance of the email behavior and the upload behavior, their settings will not be remembered when you re enter the wizard, resetting these will just add duplicate behaviors to the page like you are experiencing.
to modify the settings that are used by the upload or email, you will need to edit the server behaviors for those functions directly, not the wizard.