Moab I can't level up the terrain on the map

I'm trying to do it with the terrain elevation tool, but it happens like in the video. what's the problem ?

 

I think you're just hitting the maximum height for your settings. When you import the heightmap, or in the properties for the terrain, there is a height value. I've got a feeling when it has the max value, it uses the minimum height (not sure why). But that's most likely the reason.

 

Thank you bro