Stacked rooms

How can I delete existing rooms?
I work with lib-jitsi-meet and create custom UI. On development stage I got some issues with stacked persons in the room. I think it happens when I use hard page refresh (Ctrl+F5).
Now I have four stacked persons in one room and two in another.
I know that room should be removed when the last participant leaves it but it doesn’t happen.

Every participant has its own ID so I dont know how to clear these rooms. Any idea? Smth like cache reset on the server side or whatever?

Problem is solved by editing and replace storage=“memory” to storage=“none”. Then restart prosody