P2P happens 1/3 cases

Hi, when i connect into the same jit.si meeting from the same Chrome (twice), i see them connected to west endpoint. When I connect once from Chrome (computer) and once from iPhone app, p2p is functional. When I connect once from Chrome and another participant (via Android app), again P2P not active, but a west endpoint is being used. Can you please advice what could be the cause? With an older version, and a server of my own with that version, 2 instances of chrome tabs communicate directly p2p. Thanks

Do you see any errors in the JS console when connecting 2 Chrome tabs?