I have checked the source for the select lists on the page you posted a link to and they look to be set the same as the labels, No has a value of "No" and Yes has a value of "Yes".
In the body of the email message what do you have for the these form elements values? You would normally just use the bindings for the posted element directly here. Post back with a copy of the message body page from inside of the WAUniversal Email folder.