'Unique' layer issue - Cycles

My project: I am making a sprite for a game and have multiple poses set up on different layers. My camera and light source (sun) use key-frames to rotate around the model. I move the camera and light to new layers and render the animation, which is 8 pictures.

My issue: Suddenly after many hours of work my sun lamp only seems to affect 1 layer in my final render. When I hit render or animation it renders this one layer, if I have the light on that layer it renders the light, if not, it doesn’t. No matter where my camera is it renders this one layer.

Note: My other projects that have the same layout seem to work fine, and this file was working file. Not sure if I hit some random key or something.