Landscape material looks blocky. How to fix it?

@ I even tried creating a basic terrain in WM with 1009 X 1009 resolution and exported the terrain heightmap(RAW-16) along with two layer weightmaps(RAW - 8) of the same resolution.

Created an entirely new project in Unreal Engine.
Created a material with a black and white colors to try and check how it works.

Sadly, It gives me the same blocky look with that black and white materials.

I’ve tried in every possible way, but couldn’t find a solution.

Thanks.