Factorio Forums

The new stacked items have some issue with the casting of the shadow.
Apparently this bug is estented for every shadow casted from every object in game.

Thanks for the report however I don't believe we will be doing anything about this. The nature of stacked items and us wanting them to cast shadows themselves, but not on each other - means this ends up happening.

It's another quirk of trying to fake 3D in a 2D game.