How to Stop Mesh from Tessellating Upwards?

Hi Everyone

I’m a relatively new UE4 user and have been experimenting with tessellation, after modelling a structure in Maya 2018 and importing it into UE4 I found that the tessellation in general looks great, however I would like to know if anyone has a solution to prevent the texture from tessellating upwards, I’m using a heightmap for the tessellation and I’m using PN Triangles. (Sorry for nooby question, go easy it’s my first post).

Thanks for any help.

Before Tessellation.

After Tessellation.

The Material.