The description field that's added automatically should be taken from the meta description tag on your page. Can you check to make sure that there is a meta description tag on your page... you can send us a URL for the page if you want us to look.
Finally, you can try moving the JFBCSystem plugin lower (higher number) in the system group, and that may help if you have something that's trying to automatically create description tags. If so, you'd want JFBCSystem to be ordered after that plugin.
Hope that helps,
Alex