Going crazy with contact forms

I just wondered if someone can tell me what I'm doing wrong with the contact form at Link removed at members request

The form always sends, but the content isn't always in the email. I've been playing around with the shortcodes trying to make them show up, but I think I'm missing something obvious because only half the info shows up.

Just what should be in the additional headers and message body fields please?

Support access is still open for other issues I'm waiting for help with if it's easier to look at this in my sites back end.

Also, the site keeps returning black text whenever I try to change the form and save anything due to something which happened to do with this thread Link removed at members request which I'm waiting for help with if anyone can take a look over there.