Paul,
Looking at it again using the plan from the UK (belairdigital) as a reference, I now see exactly your issue. I was misled by the stab A/R, but proper scaling illustrates your point. (And using the brain late at night was not my best option....) The plan error looks to be the elevator, and is more than just the taper. I do note that the flap root chord scales out in the plan view to match the elevator root chord side view. Maybe it was a late night for the draftsman, too? Again, I would follow the plan view, not the side view. It looks like your picture....
Dave