The texture on the back and underside of the new stone stairs from Enchanted by Nature breaks if you use the build gizmo to extend the width of them. If left at their single width default size it looks good.
It seems they break because they have not been texture mapped in the required way. Any part of the stairs that tile when elongated have to be mapped across the entire width of the diffuse texture but this broken section has been mapped in a small area near the middle of the diffuse texture instead.
When the game tries to tile the texture it uses the full with of the diffuse texture instead which results in the broken look. It affects the underside of landing pieces as well if the stair gizmo is used to create L or U shaped stairs.
The stairs also aren't linked up to their matching wall textures. So no matter what swatch you place, they always have the wall from swatch one. Existing stairs in the game use different wall textures per swatch to match their designs.
I would expect that even if the wall textures do not get matched up correctly, the broken tiling should be fixed in an update as it limits their use.
