Why as a Bronze 4 player am i being constantly placed against Silver 5 and 4 players

Only Riven OG - Summoner Stats - League of Legends
Only Riven OG / Bronze 4 29LP / 11W 12L Win Ratio 48% / Riven - 8W 2L Win Ratio 80%, Singed - 1W 0L Win Ratio 100%
And according to this site although i don't know how accurate the mmr ratings on it is, i have significantly worse mmr then everyone else in the game.
Reportar como:
Ofensivo Spam Mau comportamento Fórum incorreto