Comments added via commentbox not shown

I included the official facebook-plugin. I have a problem with the commentbox.

It is shown on my pages. If I post a comment as “page” being one of the pages I manage, the postings are seen below the facebook-comment-entrance-box as long as I am logged in on facebook having my page active.

If I log out of facebook or change profile on facebook, then the posting below the commentbox are no longer visible. So basically, comments are only shown as long as I am logged in on facebook have the connected facebook-page active.

Other people looking at the website will not see the postings either.

This is not the way it should work though.

Any suggestions what I am doing wrong?

html://www.amsterdambeter.nl

http://wordpress.org/extend/plugins/facebook/