Terrain raise or lower in squares, why?

Is there a way to raise or lower more smoothly? It´s very wierd build a terrain, a “square mountain”, though, how is it possible to do?

Here a screnshot:

Oh, other thing not about unreal, there is a problem with the “Image upload” in this forum system, sometimes run “no such upload”, but sometimes does run correclty.

Thanks.

Surely there is. You can adjust Brush Falloff parameter for that.