Looks like the lightmap resolution is too low to represent the falloff. What does the lightmap checkerboard display look like? Possibly you also have inconsistent lightmap texel scale. https://unity3d.com/learn/tutorials/topics/graphics/fine-tuning-lightmap-parameters
Check that your shaders are using lightmaps. Looks vertex lit to me, I don't see any baked shadows.Check that your lights are casting shadows.Check that your meshes have lightmap UVs.Check that your objects are tagged as static. Suggested settings when starting out Lighting tab -> Lightmapping Settings -> Indirect…