LeaverBuster

I could not join my game because it said that check your network connection and retry, and I did so, yet I still could not join my game. I logged in again and saw that Riot realized that some people have issues joining the game, and are trying to fix it. I thought that was the problem, so I gave up on rejoining. Now I join back into the game, and it says I have 5 games of lower priority, but I did not quit or anything, I simply just was not able to join, so can someone explain what just happened?