When I press the Facebook button on your page, the following Javascript errors are on the console:
"Uncaught Error: invalid version specified" and "Uncaught Error: init not called with valid version"
This indicates to me that there is something else adding Facebook to the page as well. When I inspect the source on your page, I see the following code that is being inserted by another extension:
<script>window.fbAsyncInit = function() {FB.init({appId:1752665301648420, status: true, cookie: true, xfbml: true});};(function(d, s, id,debug) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all" + (debug ? "/debug" : "") + ".js";
fjs.parentNode.insertBefore(js, fjs);
}(document, "script", "facebook-jssdk", /*debug*/ false));</script>
The block above that is from JFBConnect and already has the FB.init call/initialization. Your page will not function correctly if you have the two sets of code on the page. Therefore, if you want to use JFBConnect, you will need to disable Facebook features in your other extensions on the page.
-Melissa