Hi Fnitrox,
I’ve set up a scene similar to yours but have not been able to reproduce the results you’re getting.
I made a similar 5 plank mesh in 3Ds Max and exported that. I created a simple material using the Pine Texture and Normal in the starter content.
As you can see in the image I’ve not been able to have the.
I may need a little more information as well to see what’s going on. I also think something may be linked to your texture that is causing the since the mesh is not showing issues without the texture when laying flat.
How is your material setup? Can you post an image of the material graph?
Also, does it do the same with other materials, particularly any that are included with the Starter Content? If not, we can rule out being something with the mesh.
If you break the link for the normal map on your material does it give the same results?
Also, if you want me to personally take a look at it you can link a download to your asset here with the texture or if you don’t want it to be public you can send me a private message with the download link.
Let me know what’s going on and I’ll look into more! 