Lichess Not Recognizing Player Left Game?

imgur.com/a/83snr

Player leaves game, my mouse shows he's starting another one. I didn't think you could have two games going at once?

it's allowed to play 2 games at once (or more)

The same has happened to me. My opponent seemingly lost connection for a while, then started playing bullet games. In between the bullet games, he'd make a move or two against me, then start a rematch. Unsurprisingly, he lost our game on time.

he gets notification when you move so he may return to your game,
you still can claim draw/win if he doesn't return to your game in time ,
I think