lawls you must really not play that often if you don't know what hes referring to.
It's always been this way, if your a terrorist and the zombie who spawns was a terrorist and you kill him they you are slayed the next round. Instead of getting the normal 3 points it gives you one point and when you are slayed the next round it takes a kill and gives a death, so you end up with 0 kills and -1 deaths. If you type !zspawn right away you can spawn as a human as long as the zombie hasn't spawned already.