[Seven Skins]

First thing you need to do is .. remove the body tag around google ads.

e.g.

<div style="text-align: center;">
  <script type="text/javascript">
      google_ad_client = "ca-pub-2427967321404401";
      google_ad_slot = "6801652175";
      google_ad_width = 336;
      google_ad_height = 280;
  </script>
  <script type="text/javascript" src="//pagead2.googlesyndication.com/pagead/show_ads.js"></script>
</div>

If you did not made the changes to the templates then your site may have been hacked. Here is the link for you to read.

http://www.vbulletin.com/forum/blogs...vbulletin-site
http://www.vbulletin.com/forum/blogs...ve-been-hacked