Hi guys! I’m having this problem in UE5.3, I tested it in other versions and this continues to happen. I also tried importing in different ways and in different formats (fbx, obj, gltf, usd, etc). I optimized the meshes and exported them from Cinema4D, Blender and 3DS max, but this continues to happen. I have no idea why this is happening, any suggestions?
I’m pretty sure they’re just editor grid lines
Try changing your snap value back to something like 10 or 100?
I think it might be better to view with these 2 images, the first image has “Lit” activated, using Lumen. The second image is in Path tracing, these strange lines appear when activating path tracing
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Ah, much better picture 
No idea, I’m afraid 
Did you find anything about this? Please check my thread. I have a similar issue.