You have a very different mesh in PrePoMax, with tetrahedral elements using the default size and no refinement. Try to make it more similar to the one used in Ansys or, even better, use the same mesh in both analyses (assuming that Ansys can export the mesh to .inp or some neutral format). Mesh in regions of interested (especially with contact involved) should be really dense.
Is the rest of the setup (e.g. boundary conditions) the same ? I’ve also noticed that in PrePoMax you apply the force only to one half of the hole while in Ansys it’s applied to the entire hole. So that’s yet another difference.