http://s1.postimg.org/4j9tgg1gf/Immagine.jpg

Hell. I'm getting this in interior cell. It seems floating grass from an existing worldspace.

My mod contains a worldspace but not green grass.

Why I'm getting this?

Thanks.

I noticed this too in one of my interiors. My advice (albeit odd) is simply to build away from it... I never noticed it because it was so far away, but it's there.