When a user visits your userlist it logs them out? Ensure you've a public and published Joomla menu link to CBs profile page. Is the domain being changed? If you go from example.com to
www.example.com
then it's a domain change and their session won't transfer so they'll appear logged out. Check the domain before and after the logout occurs to confirm if that's your issue. There's no code anywhere in the userlist to cause a logout.
UP !
Do not bump posts. It's unfair to others awaiting replies just as deserving as you. Thank you for your understanding.