ServerTravel taking clients into their own copy of the world

Hello! Basically, ServerTravel with Seamless Travel on (as it is required on Steam), takes clients into their own world, where they can do nothing. They are still connected to the server, because if I end the session on the host, they get disconnect to the main menu, but they don’t see anything I do in the level.

Why is no one answering here? It is the third time I ask this. I searched the entire internet, just give me a tip or something, please, this is urgent!