Disconnect From In-game, then being able to play a different game immediately

The weirdest thing happen to me. I was playing a Normal 5v5 like usual until I got disconnected from the game. For some reason however, when I log back on, it did not automatically reconnect me back to the 5v5, but instead took me to the homepage screen of the client. I was then able to play a whole NEW game while being disconnected in the first game somehow?

This happen before it even hit the 20-minute mark in my 1st game I was playing before being disconnected

(The match history of the 1st game is not in my list of history as well?)