3d lights casting shadows create moray patterns

When I rotate a layer in 3D space with a point light casting shadows on it, it creates a vertical line pattern. If I use a spotlight, it creates a moray pattern. When I use ambient, it goes away, but so do the cast shadows. How can I fix this? I am looking at the composition at 100% annd I am using square pixels. I have set the  bit depth to 32.