If you're using the System - Cache plugin, that should be last. The JFBCSystem plugin isn't too dependent on positioning. The cache plugin usually the problem in this case, but if that's not published on your site, let us know.
We did just release 4.1.2 of JFBConnect which has a fix for when there are line breaks within the first bit of the description. It's possible that upgrading will fix your issue. If not, can you post a page where we can see that happening?