If a player leaves within the first 10 seconds of the match, the game is cancelled and nobody loses SR. If anyone leaves AFTER the first 10 seconds then you’ll get the 2 min wait time before you can leave without facing a leaver penalty, if the leaver was on your team. It’s standard for both teams, so what you described as an unfair situation where it only happens to your team isn’t accurate. It just depends on the time when the person left.