It's not really a stumper the way I did it. According to the groupings, the correct answer displays. The problem is that's not the answer that you're expecting.
Shifting gears a bit here, I'm thinking that this whole thing is just not quite right. We're preaggregating data for an Excel Pivot? Why not just let Excel do the aggregations during the Pivot?
--Jeff Moden
Change is inevitable... Change for the better is not.