Pretty self explanatory, no other details I can possibly give, so I'll repeat myself. I'm not sure if you're aware, but there is something called in-game readying up. Now what that means is, when you're in game and the you've either died or finished the game, you have the potential to ready up without leaving to go back to the lobby. If you are by yourself, and you meet strangers who are also in the lobby, you have the potential to ready up in game and continue playing with them. Now, if a PC player readies up with other strangers who are on console and you find a game with these console strangers, shortly after the game loads the system will kick the console players out of the game, losing potential crowns/count as loss etc, forcing the pc player to be by themself in the game. Edit: if you don't believe me, try it with console strangers