How do I fix these lines in my normal map?

Thanks Eric,

Here are my settings, although I’m not using multiple LOD meshes at this time. Just the one base mesh. I also took a screenshot of the model in the previewer window when you open the mesh in Unreal. As you can see, the model looks great with the normal map applied when viewed in this window. It’s only in the actual level that it has the lines running through it. Not sure if that’s helpful, but I thought it might be pertinent.