Has anyone seen this before? The free insert on the left is much more white and papery than the ones on the right, which are much more plasticy and see-through. The left one brought up a faint line, but the two on the right are negative. Im wondering if the left one is either fake or simply a different batch and if its likely to have different sensitivities to the right ones being obviously different material. Has anyone seen this before. The two on the right were from the same pack, the left was one of a different pack. Any thoughts?