Cloth Renderer's shading

When I use Interactive Cloth, sometime, meshes black out wrongly.
I hope drawing like this. However, from some angle, became black out like this. It's happen in using point light or spot light. My friends,bug spotter, says this can see only with Geforce cards. (They says Radeon couldn't see it...) Are there any way I can do to avoid it? or Is it a bug have to wait fix by Unity?