Got to love Riots MMR system
Winning Streak ended with my team
B2 Jungler B1 ADC Unranked (B5 Top) Unranked (B5 Support) S4 Mid
Enemy team S4 Top S4 Jungle S5 Smurf Mid (has multiple champs in the 80% win rate) S4 Smurf ADC (also multiple champs in the 80% win rate) S5 Duo with ADC Support
op.gg shows enemy team has 100 more MMR (fyi thats huge in Silver)
But Riot does not stack games.