I'm attaching 3 pages.
index.php - is the page you viewed that isn't working correctly.
new_series.php - is a page in the same folder as index.php and it uses the same theme files. It works correctly, but doesn't contain an accordion.
alf_cms_blank.dwt.php - is the template that the theme is using (This is where the basic jquery files are being called in).
I know what you're referring to regarding the multiple html, body... tags. It only occurs on the pages that use an accordion. It appears that the page loads the theme nested inside of the accordion div for some reason.