Sorry for the delay and confusion on your URL.
I'm not sure what the issue is with Facebook scanning your page. As Melissa noted, the only time we've seen a similar error is when GZip compression is enabled in Joomla. Even then, the issue is not a problem with JFBConnect but Joomla itself.
In your case, there must be something else preventing them from scanning your page. You may need to submit a bug report to Facebook to see if they can help determine why the scanner is having issues. You can report a bug here:
developers.facebook.com/bugs
One thing worth testing on your own is simply creating a raw HTML file and seeing if the Facebook URL debug tool can scan it. That way, it's not something that's generated by Joomla, which will narrow things down quickly as to what may be preventing their scanner: something within Joomla or a configuration issue with Apache itself.
I hope that helps,
Alex