see through grass when bill boarding is off unity 5

not billborded

billborded

the terrain doss not do it. Only where there is grass and where ever my directional light hits the grass shows up like that i thought it was reflecting at first but, I put most of the structure under the terrain to see and it shows all of the structure under ground. It's a new scene so all shaders and everything is at default (for Unity 5) just want know if any one knows how to fix it? I prefer it to not be bill boarded.