Remaking a game when everybody play.

Today i played a game on EUNE server with my account called 'Egnarock'. I played as Jhin ADC and** everybody from my team and enemy team played**. But on 3th minute of a game our team got a offer to remake a game - so we remaked that game and I wanted to know why this happened, so I looked at my match history. And on that game, on my account, is written: LEAVER (REMAKE) - this means i left that game and remake happened because of me. I also got grade D- for that game. So I will like if can somebody explain me how that 'remake bug' happened when I was playing from start of the game. You can also check that game on my profile if you play on EUNE server. Thanks everybody for help.