Example is here.

Code: 
http://photostash.me/share-EE99_4FD9791F.html
Comment box should be below picture. When I put code it shows only once and after refresh it is gone. BTW I had same problem with facebook like button but I put Iframe version so it works but comments box does not have iframe

I don't know if this mean something?

Code: 
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="Public">
I tried to delete this line but nothing happens

Anyone have any Idea?

EDIT

Thank you for trying to help me - I will explain how I did it - just in case if someone else have same problem

Before <html> I added

<!DOCTYPE html>
and then I added this two lines in at the place I want FBcomm to be displayed

<script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script>

<fb:comments href=""http://mywebsite.com"></fb:comments>