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?

It seemed to be going well until I got a +10 out of the blue, my combat score remains about the same but yeah I was two negative... doesn't feel as though that should remove 12. Then there's a loss and it's -29... a bit disproportional....