The values will display null if you've set them not to display. This protects privacy. However, they are Fields, which means if you do not want the field at all to display simply disable it in Field Management. It is a system field, but you can still set it not to display on profile.
Again, these parameters for the plugin control the display of these items in the Tab. There was an error in the XML file that was not hiding such selections when you've selected to display as fields. This has been fixed for later release.