I just discovered the issue. My hanging positions are on a different layer than the lighting devices. I have show/snap others selected for layer options. In that setting, the lighting device snaps to the hanging position, and the hanging position auto-fills in the OIP. So I assumed it's snapping to the hanging position. But, it still doesn't take the height. When I change to show/snap/modify others, the hanging position turns red when hovering on it, and the lighting device takes the height of the hanging position. I rarely work in show/snap/modify others mode. Is there a way to have the lighting device take the height of the position without being in show/snap/modify others layer option?