Could be both, but in my experience, its the architect. A shaper can and will shape whatever you want in most cases.
On the other hand, when the plan calls for extensive mounding, its hard to make each one different and most shapers have only so many tricks to make them look different. Lastly, it might be the contractors fault for not giving them enough earth to fill the bases properly and tie them into natural ground.
But, in the end, the gca approves it, and probably wanted it, or at least drew it that way.