all of the pages have the same problem, there are duplicate doctype, head and body tags on your page, this is causing the problems.
are you applying a template to the pages after they are created? or do the pages already exist? It looks like you have pages that already exist that have poorly formatted code. Delete the pages and run the Security Assist wizard again to re create tehm without having the existing pages in place.
to apply your site design after security assist has created them, you should use a template.