Guayo,
Content plugins in Joomla are handed the articles text and can then alter that article text. Our content plugin does this by appending the social buttons to the end of the article.
If re-ordering the plugins doesn't change the order of the features, it means the other plugin isn't simply appending the content and likely looking for a specific place to add whatever it's doing on the page. There isn't a way in JFBConnect that we would be able to re-arrange where the other plugin inserts it's buttons or whatever you're trying to do.
I hope that helps explain, but if you need more information, just let us know. Also, if you want to tell us the name of the other content plugin, that may help us look into what it's doing and possibly provide more information. You'd probably need to contact the other developer for a full solution though.
Thanks,
Alex