Something odd is going on because you are getting lighting from certain angles. If you post the .ma file I'll take a look at it. Also, you might try reseting your userprefs.mel file.

Can you create a new object like a cube or sphere please and tell us if it has it's lighting messed up? If so open a brand new maya scene and then create an object and see if it's lighting is messed up and let us know.

I am trying to find if you have a problem just with this scene file or with your global preference settings.

-Rick