The season six ladder system

Every new season you have to play 10 games to 'rank' yourself. Well i played 10 games and won 7 of them. The last 4 games i won in a row and i scored an S every game. How can it be possible that i end up in bronze 1, while i was silver 2 before season 6? I really enjoy playing league, but this ladder system f*cks up my day . (i got flashed by the league system like : )