Hosting Session makes client join session automatically

I’m trying to reproduce the Multiplayer Shootout game for a project of mine (I have only partway copied it), but when I call the create session node on the server, the client automatically joins the session instead of staying at the main menu.

My Host Game function is exactly the same as the Multiplayer Shootout one, as is the Join Game Function.

This is done on a single PC in Editor and I also tried using shortcuts.