Random Circular Shadow

I have a problem with building to Android. I have set the quality default setting of Android to Fantastic, and have deleted the Sky Dome that I use as the background and built the game, along with the plane that is green, however there's a circular shadow casting over half the screen that isn't visible in the Unity Editor still.

In Editor: http://imgur.com/a/cnZIX On Phone: http://imgur.com/a/DKJ5P