fan box module doesn't show faces

Valerios,
I'm honestly not sure why that's occurring, but it's not specific to JFBConnect, it seems to be an issue with your Facebook page itself. If you use the configuration tool from Facebook, and put in your Page URL, you'll see that the faces don't show there either:
developers.facebook.com/docs/reference/plugins/like-box/

If you use our page URL on that configuration tool, you'll see the faces show up normally:
www.facebook.com/pages/SourceCoast/141717952527296

I don't know of any configuration settings on your page itself that could cause the faces not to show, but I'd recommend going through the settings and see if there's anything in there you can change that may have an effect.

I hope this leads you down the right path, but it's the best suggestion I can give for now. Should you come up with anything, let us know!