Session timeout settings ignored. Keycloak 6.0

We have configured Keycloak server with following timeouts:

However sessions remain alive even after 15 mins. Looking at the specific user “Sessions” tab shows that there was no access since since login time. I also monitored network connection and there are no “refresh session” or any other requests.
What is causing for session to stay alive? Am I missing something in my understanding of the session lifespan?

Thanks in advance.