Terrain auto smooth - streaming textures

Hi Im working on a project that takes real heights maps.

At the beginning the terrain was working good without any problems, but now the terrain makes something like AutoSmooth - and changes all the terrain and makes all my assets none visible `cause the terrain changes.

Everytime this happens it show a message that says Streaming Textures (300) but the number increases while I move. I tried looking on the Unreal Guide but cant find something to fix this.

At the first time this happen I just reloaded the project and this was fixed but now keeps smooth.