So on my server I have MultiVerse, and one of my worlds is a flatworld. I want to try and make a mountain on this world, so I made my stone pick a brush that create sand spheres. However, when I place a sand sphere, it just melts right through the grass and goes into the "infinite void" that's beneath the bedrock on the flatworld. When I do this on any other "world," however, it works just fine. Why is this happening? Is my plugin corrupted or something?