If they aren't equally sized on your map and you know they are on your 3d model it is because the facets (each is a 2d surface) are going either toward you or away from you in 3d space. That is the biggest facets will be the ones that are only aligned on the XY plane and have no tilt into the z. If you make your eyes look at the computer screen as a flat image and forget that your model is 3d, you will see when you rotate a 3d model that the facets look like they are smaller when they are rotating into the z axis (into and out of the screen). By the way, I wouldn't apologize for your English skills.