It may appear to be similar to some other problems described here but my pure Blueprint scripted NPCs aren’t aiming up or down when the player climbs a ramp or the other way round. @DanM a tiny look here will help a lot! 
Your Aim Offset is inverted, -90 is looking up and +90 is looking down. Don’t know what’s wrong with the aim though. Will look at it tomorrow
Fixed and all corrected! Thanks though.
I’m not marking it as solved since you found another error probably (invisible even to me).
What do you mean?
This?
What you were talking about in the OP. Aiming not going up and down
Shutting it then.