I have the following issue, when I have sprites that have multiple layers, each layer is casting a shadow, and the shadow is cast on the layer below it, which looks weird for some entities and less so for others, but for example:
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Calling attention to the way that the shell on the construction robot item on the belt seems to stand point more than it should, and the way the arrows on the miniloader also pop out.
I have the entities used to make the icon on the right for comparison.
I also made this example that shows just the base layer used for the sprites, compared to the icon with all the layers:
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This may not be the best entity to convey the issue, since the shell is casting a shadow more or less where it should be, but in the animation above you should notice that the shadow becomes more dark, more intense when all the layers are turned on.