If you click Quick Match, then click 'Cancel' most of the time you will see a defeat screen and your rank will be lowered. For whatever reason the server registers your game as having started before it lets your computer/device know so there's always a possibility that you will lose rank when you click 'Cancel'.
On top of that, the server glitches and thinks you're in a game which means you have to wait 2-5 mins for the game to time out, even logging out and logging back in doesn't fix that.
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