Hey,
I will try to look deeper for the reasons of these kinda happenings and listen to what people experience and come back with a bigger more detailed bug report sometime in the future.
Had another fun experience today with the game. people joined some other host but were in my chat for my hosted game.
I could talk to them, but they could not chat with the players they were with.
this was while i hosted a game and after loading.
It may look like either the server Ip was duplicated or the chat and/or server intrude on eachother if people create games at the same time ? idk. have fun solving it xD