In this example player "Sobrijoska" and player "XoroTheWise" are shooting each other
{F53319}
XoroTheWise is getting the first kill, and Sobrijoska is killing him after he already died.
{F53321}
Note both players scored a kill and a death:
Sobrijoska still having only 12 kills (+-0) and 6 deaths (+1)
XoroTheWise got 7 kills (+1) and 5 deaths (+1)
This is a very common problem in the re spawn/death mechanic as the script is trying to assign the points for the kill to the player, but the player is no longer in a body, thus the points will not be transferred.
(This issue is hard and annoying to deal with, having that problem on our arma 3 CTI mission).