Pinging @anoek on this one.
This has been reported here:
https://forums.online-go.com/t/bug-in-game-chat-doubled/10521
You could specify those games there to help @anoek out with fixing that issue.
As mentioned here:
https://forums.online-go.com/t/list-mode-for-active-games-under-home/10476
This is now configurable on settings.