Problems with Jetpack′s Publicize plugin

Hi, i decided to make a facebook page for one of my blogs and use the publicize option give by jetpack whyenever you are making a new post.

And for new posts its working fine.
But whenever i go to my old posts, that are already published, and try to edit them and republish so it can be posted on the facebook page, the Publicize checkbox with my Facebook page is grayed out, and i can′t select of de-select, and when i update the post to save it, nothing happens, it doenst gets posts in my facebook page.

Is there a way to make all the old posts get published on the fb page without having to mannually do it?

For new posts it works ok, its just for the posts that were already there before i decided to use the Publicize option.