Profile View after logout

I am facing an issue with simplesamlphp, recent log in drupal showing same timestamp with multiple logins by one user(user A), the is his email address. during these transactions another user(user B) in a different country hit logout and apparently got redirected to user profile page of user A. is it something related to a bug or functionality?

simplesamlphp 10/30/2019 - 06:18 Load user [] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Authname is [] userid is [0] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 _simplesamlphp_auth_get_authname: Valid local session... Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Load user [] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Authname is [] userid is [0] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 _simplesamlphp_auth_get_authname: Valid local session... Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Load user [] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Authname is [] userid is [0] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 _simplesamlphp_auth_get_authname: Valid local session... Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Load user [] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Authname is [] userid is [0] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 _simplesamlphp_auth_get_authname: Valid local session... Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Load user [] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Authname is [] userid is [0] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 _simplesamlphp_auth_get_authname: Valid local session... Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Load user [] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 Authname is [] userid is [0] Anonymous (not verified)
simplesamlphp 10/30/2019 - 06:18 _simplesamlphp_auth_get_authname: Valid local session...