Tremble, You Who Peer Into The Dark unbeatable

The Client Order requires you to defeat three different enemies however for whatever reason something isn’t triggering when killing one of the three. I’ve killed two of the enemy but it still says I haven’t killed even one. In the screenshot you can see the Client Order says I haven’t killed it yet in the chat you can see that I have

Are you playing Phantom? It only counts if you are a Phantom when you get the kill.