landscape lighting broken?

I can’t get lighting to appear correctly.

I have a basic material: albedo and nothing else.

It’s like the normals aren’t calculated properly on the landscape. I’ve tried Build->Build Landscape.

I just have no idea what’s wrong.

here’s a simple point light and as you can see it’s just… wrong. Directional lights are wrong too.

I even tried enabling nanite and building that just on the off chance but nope. I can’t seem to fix it so i’m guessing it’s something very specific that i’m missing through ignorance.