That looks to be a bug in JFBConnect due to a slight change in how Facebook sends comment notifications. The issue is that Facebook is adding extra query string variables that JFBConnect needs to strip out so that the URL doesn't look like a different URL that should have it's own separate comments for.
Fortunately, it should be an easy fix. Can you please edit the /components/com_jfbconnect/libraries/utilities.php file. Around line 106, you'll see:
$juri->delVar('fb_comment_id');
After that, add the following 2 lines:
$juri->delVar('comment_id');
$juri->delVar('reply_comment_id');
Once you do that, the link you provided above should show the comments correctly.
Let me know how that goes. I've already added this to our issue tracker and it should be included in the next release as well.
Thanks,
Alex