Shader issues in Modular StaticMesh

Thx for yours answers. I create a 2º UV Channel with enough space between islands and snaped vertex into the grid:

cb515e8a5af547fc53d7fb81ae70edc2a6014112.jpeg

But still the same problem: #&:mad: lines appears again! The funny thing is i have a modulate floor built with the same process of the wall and every thing is ok with it: No ugly lines between meshes.
So after hours of yoga meditation i found the incredible solution… I distroyed the wall and remade it from scratch using yours advices. Now there is no lines and everything fits perfectly

5edcc96ce1f7982891b842b432ad9e10e2451724.jpeg

Thx all of you guys.