I don't know why it acts like this; This also happened to the shooter AI when it was too close to the First-person character. The AI stop shooting for some reason. I would like advice on how to solve this issue. Thank you.
That doesn't look like it's the integration demo scene. I recommend using the demo scene as an example, and then creating your own behavior tree from scratch. This page gives an overview on how the behavior tree works so you can create your own:
This integration package can be downloaded on the downloads page. The Opsive Character Controllers are integrated with Behavior Designer allowing your AI to perform any . . .