bumped diffuse Shader not behaving as expected (reversed)

I am trying to use a bumped diffuse shader on this cube gameobject primitive from unity. I did not rotate the directional light from the 1st to second capture. The first box has diffuse applied to the material, while the second has a bumped diffuse shader. The parts that are angled to the light in the diffuse detail show lighter tones while the dumped diffuse has darker parts. I made a simple test texture to test this. I attached the import options for this texture.

What can I do to solve this problem? Do I have a weird setting? Thanks!