There is a strange bug with Augmentation, where a Shaman’s Grounding Totem will “ground” the damage of upheaval from only the primary target of upheaval, but not the targets in the AOE effect.
Because Upheaval is a positional spell on the ground, I know it should not be effected by Grounding Totem (much like fire breath is not effected by Grounding Totem).