Fields are missing from the email notification

This form was tested, and everything came through fine.

Then some of the fields have disappeared in the the codded area example {will you be attending}.

I have since added them in, but would like to know what is causing the problem?

Question #2, the client is receiving duplicates of the form.
What would be causing this to happen?

Thank you

If you modify the form by adding or removing a field, you need to verify that email notification is updated. Also if you modify the email notification make sure all the field variable are properly update ( See below the email subject from one of your notification is missing a curly brace ).

Question #2, the client is receiving duplicates of the form.
What would be causing this to happen?

You actually have two email notifications on the form. Unless you plan to use condition to send different email, only one notification is needed.