It looks like you have applied your template to the confirm.php page. That page is loaded into a DIV on your checkout page via AJAX, so you wouldn't want the template applied to that page. You will have to open the page and remove the repeated content from it.
The 404 error is occurring because it appears you haven't uploaded some necessary files from the /webassist/ folder... I'd just re-upload the entire folder.
Specifically the file: http://www.byrdclothingcompany.com/webassist/framework/ajax_wrapper.php is missing... but there may be others, so I'd just upload the whole thing.