Scene showing in game window?

Hello, Unity noob here, I have no idea what I’ve done but now I have my scene windows showing in my Game window, superimposed on my normal game view, here is the screen shot:
link text

To be clear: the 2 yellow balls are both the sun, one with rendering in game, and the other one a copy from the scene view. The “copy” moves if I move my scene view.

I found out this is happening when I remove my camera background, but I still don’t understand why it is showing me the scene x2 in the game window. Could anyone light me on this? Thanks!