Double Body Tag Causes Wordpress Site Not Working Properly

Well, I have strange issue. Most of Wordpress sites hosted on BlueHost have double tag when the HTML code has only one. Having double tag causes issues with Wordpress sites to be

Solution 1:

"Most of Wordpress sites hosted on BlueHost have double tag when the HTML code has only one."

Absolutely not. Where did you get this idea?

There are many reasons you could have a double body tag. Can you paste what you feel are relevant snippets from index.php, header.php, and footer.php inside your theme folder. I'll update my answer accordingly upon seeing these.

Solution 2:

Well, it looks like our BlueHost account got hacked and each WP installation got code injection into wp-config.php file which looks like http://pastebin.com/zbVFcUHZ

For me it looks like server level hack because all wp-config files were "infected" at exact same time, some of those sites were behind .htaccess password protection and WP engine prevents write to that file when WP is already installed.