Ok so im making a map through hammer..i test it out a few times..then i add alittle more then out of no where there is grass growing everywhere one the base of the map..I didn't add this.but does anyone know how this got there? Thanks

Bug?

OK. When you compile a lot of times a map, sometimes appear strange things (Like a door that open one time only, changed textures......) Solution: Build again the part of the map that fail. I have to do that a few times in maps that I compiled to try the illumination, a prefab....