I got placed as a Bronze 3, the placing games went very well. But then I started playing a little and every time I just get demolished, ranking last place in the whole match for almost every game. Why does that happen?

So, yesterday I(Sova) had a game where my friend (Omen) disconnected around the mid game - after 8-9 rounds - due to some internet problem. We played 4 vs 5 but managed to clinch a victory in the overtime. I got a slightly increase - one a...