Seams causes Discontinuous & How to avoid moire

Hello.I’m pretty new to Unreal.
In my project,there come a lot discontinuous on the wall.But in 3dMAX, they are normal.
Why discontinuous happen?How could i reduce that?

But when i change the saterial‘s texture ,discontinuous seems disapear!

Please tell me how to deal with that.Thanks.
Also, there are a lot of Moire.Is there someone who can tell me how to avoid that?
When i switch to Temporal AA, the moire becomes twinkling.And when FXAA on,it’s not.

Is the beige material made out of a texture or color?

Also, in the future I’d recommend posting these as separate questions so each one can be answered individually and easier for others to find in the future.