On slayer game mode I notice that my score is not what I'm counting in kills. So I changed my gameplay to start assassinating. And I counted 35 kills. My in score was 12. Only 4 where registered. But I counted over 10. No one was around at the time. On one of my games, I had to have got 40 plus kills. Near all were headshot. And not assist or kills were being added.
Kills not registering.