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Super user is showing in list of users - How to stop this from happening?
1. Please you upgrade your jomsocial to the latest version 4.1.4
2. it can be issue from your 3rd party com_xius, please you disable that component and try again.
in this site
bamboothemes.com/miller/
you are still using old jomsoical version, I suggest you upgrade it first, may I know this issue happens on jomsocial members module or from list members page?
I also afraid this issue caused by conflict with Joomlaxi User Search componenent.