The problem is that they have not stretched the leather equally on both sides of the central seam or there is a generic fault in this particular bit of the hide. Plus, the foam beneath might also not have the same packing effect on either side of the seam. Either, any or both ways, it's faulty.
The leather they use is pretty thick and unyielding. I can sort of understand why it is so difficult to stretch proportionately on either side of the central seam. Anyway, they've stitched it longitudinally which is wrong. It should have been stitched across so that the leather has a smaller footprint and would show less deformation when a posterior, especially a bony one like mine, rests on it.
