#1 Looks like that the host did this: refreshed the seats,bcs of the reason wakaranai said.
When you do this,there is a bug: one of the players in become INVITED to the game. Looks like he decided to remove you,after that.
That bug only happens if the player joins while you're refreshing the seats because lord fizz won't fix that bug. If he was there way before that, that can't happen.
#2 It started and you got booted.
Possibly. Check game filter, set to public chat, look for the game.
The game may have been deleted.
^ And this is the most probable one. Check your past games for it, if it's not even there, the host deleted it.