Something else is inserting the Open Graph tags into the page. Normally, JFBConnect will actually remove other conflicting Open Graph tags, but it doesn't seem to be doing so in your case.
Do you know if sh404SEF is inserting the other og tags, or do you have another extension doing that? Either way, I'd recommend moving the JFBCSystem plugin to a higher number ordering so that it executes after the sh404SEF plugin (or whatever plugin is adding those tags). That should allow it to properly detect and be compatible with the other og tags.
Hope that helps, but if not, let us know.
Thanks,
Alex
Problem with JFBconnect and sh404SEF
