Open Graph backend settings has no effect

Hi,
From some reason even though I set and enable the open graph settings - they are not included in the article source code.
example can be seen here: www.kfaryona.com/web

Just pick up on article and check out the source of it.

I use the following open graph settings:

image=http://www.kfaryona.com/web/images/stories/jfb_kfaryona_logo.jpg
site_name=אתר כפר יונה
and the description is the first 100 chars of the article itself.

One lead might be the fact that im using {JFBCComments width=649?>} tag inside JComments plugin in order to better control the position of the Facebook comments. Could it be that this actually override the backend open graph settings???

thanks in advance - your support is great!