I didn't get it at first but you're right, it's horrifying. They put the total and the breakdown into the same pie chart.
Yup. Something I wouldn't consider adequate work from a 6th grader.
Oh man. I was annoyed by the breakout of the second pie chart which seemed needlessly confusing. But the left one is worse for double counting everything.
And it has a typo! ("Analys"[sic]). That doesn't really bode well for how much rigor the rest of paper had, either in its creation or review(s).
Why? The labels are given in absolute units but they are correct.
The issue is that the pie chart included a slice for the total and then two slices for each of the two components that sum to the total.