Why is MeshPrefab assigned layer 6 and Wireframe is not

Just a general question. I’m using the ARmeshmanger to extract a ply of the current mesh and when I use the provided MeshPrefab the mesh objects appear on layer 6. But if I switch to the wireframe prefab they appear on layer 0. But I don’t see what’s driving that, there’s no layer set in either prefab. the ARmeshamanger code doesn’t seem to specifically set layer six anywhere. So why does it happen?

Thank you.