It shouldn't, unless you have a template override for that page of JFBConnect. Can you check your /templates/<your_template>/html/com_jfbconnect/loginregister directory and see if a file named default.php is in there? If so, rename the file to default_old.php (for now), and see what happens.
If the directory doesn't exist, or if that doesn't fix it, let us know. It may just be best at that point if you can PM us admin credentials and we'll take a look to see what's going wrong.
Thanks,
Alex