Zepir's Map Editor--Terrain Results

Why is it whenever I install Zepir's map editor I can only use it ONCE to place terrain before I have to trash it and copy it again? And also, look at this screenshot. This is what happened when I tried to make a tileset with Dalaran Tiles and Lordaeron Summer Tiles. Why is this happening and how can I fix it?

I don't know about your first problem.

The problem with the terrain textures can't be fixed except with a modified CliffTypes.slk file but you can't import that file into a map so it's rather useless if you don't make a campaign or total conversion.