Bruce,
I just signed into your site using JFBConnect. After that, I logged out and then back in using the blue Facebook Connect button using the same Facebook credentials I used to create the account.
Additionally, when I first registered using JFBConnect, the Joomla username was "sourcecoast". I was able to successfully log in using the Joomla login form as well
Not sure where your problem is occurring. I see you're using Community Builder as well. Please ensure that you're deleting the user from CB as well. This should occur when you delete them using the Joomla User Manager, but if the CB plugins are not enabled properly, that could cause issues. Finally, you can also delete the application from your Facebook account by going to "Account->Application Settings" in the top right. This will force the pop-ups to appear again that ask you for permission to connect your accounts.
Hope this info helps. We'd really like to get you set up!