UE 4.26.2 Landscape broken

Hi,

I’m having a big trouble on landscape.

It is become so weird, why is this happening?

I used heightmap and auto landscape material. At the beginning, it working fine. But somehow, I don’t know what is causing this, landscape broken. Thanks to version control, I revert back and it worked fine. But when I do some changes or save the map, it broken again. I really don’t understand what is causing this problem.

I’m open the every suggestion. It is really annoying problem…