Object not moving in Y but position.y falling

Hello, I'm getting some conflicting results from the inspector and the output of position.y for all the characters in the scene. The position.y is slowly falling even though no change is seen and I'm using a ray cast to see if player is in view, but since the position fell below the ground, there is no hiding.

Any advice on fixing the behavior would be greatly appreciated.

As a side note, I'm using code from the old (Unity Stealth Game) tutorial still found on their YouTube channel.