Forge: 34.1.19
Mod: 1.16.2-2.2.6

Item models have a darker shadow on the right face, but this effect is almost non-existent on the weirding gadget's item model.

Yeah, I'm losely aware of various shading issues with most of my mods for reasons I haven't yet nutted out.

It looks to me in that screenshot like the weirding gadget is actually shaded on the top and not the sides.