The killfeed is currently showing every single attack as having killed an NPC. The feed shown in the image was one fight that involved only one Festerhide Grizzly and one Frenzied Nightclaw. This happens ~90% of fights. In open world situations it seems to happen 100% of the time.

I've noticed this myself too and have a plan for a fix just need to sit down and do the testing. Should be either later tonight or tomorrow after I'm done with work.