How does this ranking work? its seems broken

How does this ranking work, it seems like it’s totally random how you get points. In my first game I get 3 kills outside the top 10 and get 4 points.

The second game I get 4 kills where 2 of them are in the top 5, I get 0 points.

The third game I get 0 points again even though I get 2 kills in the top 6 and 3 in total… it seems totally random how points are given.

and yes I did read this Introducing TRN Score
But it has not removed Pub Stompers and, do the people who designed the system play fortnite themselves?