material on box brush vs static mesh

Hello, Sorry for my bad english, I use Google translate…
I am trying to make the textures of the house that I am producing … and I realize that the textures do not react in the same way on brush boxes on the static mesh … Is it a bug?
In the image below the Static Mesh is on the left and the brush box on the right …

Most likely your smoothing or UV mapping on the static mesh has errors

that’s it! thanks!