Hello mate! I saw this issue before long time ago in older versions as well but it has been rare. All the configurations you pointed are ok I think. It seams to me to be some resolution problem, It needs to be even, and nothing in the asset itself as I jsut updated it and it's still working with no artifacts. And yeah, you need the pixel perfect camera, did you change the sample scene in any way? Did you purchase the asset in the unity asset store or here?