A website I'm currently working on is http://www.troubi.com . Please don't care to look at the source code.
If I validate the website through the w3cValidator a lot of errors occur all due to "invalid" meta tags. ( http://validator.w3.org/check?uri=http%3a%2f%2fwww%2etroubi%2ecom%2f )
If you look at the website's source you will see that everything in the meta region looks perfectly valid, and that's the curiousity.
Now comes the point, in Firebug it just looks like if all the included meta tags were just moved to the <body>!
A screenshot from Firebug:

For reference, this is the meta file that gets included: http://www.troubi.com/feature/meta.php
<meta .. />– pritaeas Aug 8 '12 at 11:15>and/>are valid closings in HTML5. – Michael Aug 8 '12 at 12:15