Not doing anything wrong. The landscape tool just doesn’t handle quick deep transitions from horizontal to vertical very well, as you can imagine if one vertex is very high and the next one very low you are going to see triangulation. You can work around by increasing the scale of your project assets (double scale of assets doubles resolution of the landscape mesh), avoid quick transitions from horizontal to vertical and small highly defined features, not just in unreal but in most projects you’ll see where they have vertical surfaces or sharp edges such as cliff edges sculpted landscape asset meshes are used. You get a feel pretty quickly what you can sculpt using the landscape and what you need environment assets for.
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