Photon does not delete empty rooms

I'm developing a game using Photon as Playfab add-on. When the development was coming to an end I was very disappointed with such an unpleasant moment: at some point the rooms in which there are no more players have ceased to be removed from the list. The screenshot shows the contents of the list of rooms that I get in the OnReceivedRoomListUpdate () method. These ten empty rooms have been
coming for a week. How can I fix this?