NPCs Over and Under

Any idea why some step on NPCs would appear above the hero while others on the same map appear below the hero?

Here's a couple of photos if you need to know what I'm talking about. I assume it is an easy fix, though I'm not sure how to make it happen myself. In this case, I need all of the NPCs to be below the hero.

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Cornbread Chemist

There is an option in the map settings that determines if the Hero and NPC share a layer, or if they are each in their own layer.

When they are all in the same layer, their overlap is determined by pixel Y-value, but when the Y position of a hero and an NPC is the same, the sort order can be unexpected.

I see now! Thanks James.

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Cornbread Chemist