Header Text incorrect sizes

I really like your theme. However, I am having an issue. When I select my main header and make it header 1 it is about the size of header 3 should be. Then Header 2 is larger than header 1. Please see http://totalmobiledetailing.com/index.php/car-detailing-faqs/ and look at the New vehicle protection services. That should be smaller than the other headers.