Heroes V S.T.A.L.K.E.R

Here is the attachment – it contains a Photoshop file with a grid, a basic texture, and one of the three textures. You can see that there are discrepancies. To put it more precisely, I don't understand how this could have happened, especially since these are game textures. It seems like some of the UV mapping elements (the grid on which the texture is drawn) were flipped, perhaps by 90 or 180 degrees, and one texture was drawn as is, while other elements were flipped and a different texture was drawn. It's strange.