Could you try to update to the latest version of Jetpack, 2.2.5?
If that doesn't help, could you try to reset your Publicize connection, as explained here:
http://jetpack.me/support/publicize/#reconnecting-facebook
If none of this helps, I would need to know your site URL to investigate further.
If you want it to remain private, you can also contact us via this contact form:
http://jetpack.me/contact-support/