Stange, I saw people winning 2 maps in a row, ( + 1 and + 0.5 ) and still 0.00, so they had to be at LEAST -1.5.
Showing the negative SR would help to explain everything
To bad it cant be seen by the server when they selfkill when they her the Bieieiieip ( Panza incomming ) , so no use to count that as a kill.
Lot of people have /bind mouse4 kill
I liked the solution : Delay a selfkill with 2 sec.
That seems to solve every problem.