Why do I have to put my email in twice for free tickets?
This is the ticketing form and was designed to have the option to to have the ticket buy and the name on the ticket (ticket details) be different. While your tickets may have no cost, the formatting will stay the same.
Don't worry your guests will not have to put in their info twice! If it is the same you do not need to enter the information twice the form autofills for the information added into the ticket buyer section: