Hello Guys,
I have scanned mesh, made unwrap in Reality Capture and have multi materials in 1 object, like 70 materials in 1 object. Then imported in 3ds max, made some corrections>export> import in UE4, got this problem. This is unwrap problem for sure. Maybe I have some import/Export issue? In 3Ds max textures r okay. How can I solve that problem? Maybe problem is from reality capture coz i made unwrap there? help 
In 3Ds max Textures r okay.