Toggled off the shaders, no luck. I am using a second image as a mask, that looks like that might be causing this some how? Not sure why. The lines do no appear in the masked image, and shaders are off on that one as well.
But if I unmask it or view with no effects the lines vanish.
Also I have not done anything insane. I remade the project same issues. All I do is add the 2 images, mask one to the other and boom lines.