Alright, still strange, but progress. That's a bug that was in the 4.3.1 release, but shouldn't be in anything later. I'm assuming you're using 4.3.2 or 4.3.3, but I'm not sure.
Please try enabling the JFBCSystem plugin, if it's not enabled, and see if that properly gets into the admin Overview area. If not, again, please go to the Joomla Update manager and hit "Purge Cache" and "Refresh" to see if there are any updates that are listed for JFBConnect.
Thanks,
Alex