Why are my shadows on my meshes, flat?

All shadows on the object are just 1 color. There's nothing special about the shader, it's just a lambert and it doesn't change when I change shaders. I messed all with the quality settings, all light settings, fog settings, ambient settings, rendering settings, I don't know what's causing it.

Here's an image of what I have with lights on and lights off. Then the last image is the mesh placed in a new scene with 1 directional light (this is the result I want)