Are both sites showing a stream from the same Facebook Page? If so, that would be very strange.
The stream in the backend is always pulled on-demand. That means that it's not a cached version or something.. that's what JFBConnect sees from Facebook. As to why, that's a better question. Is there anything that's happening with the more recent posts, like are they set to private or not standard feed posts? Things like video posts or other non-text posts are not imported. That's about all I can think of, but I know that's not much to go on.
If you still need help, can you post (or Private Message) us:
* A url to the page with the stream
* A link to the Facebook Page
With that, we can at least compare what is shown on your site vs the missing posts to the Page.
Thanks,
Alex
Facebook stream out of date
