In specific, the Report "Category: Summary Chart"
The report and the the chart provided shows equal distribution across all categories. Example: In reports for the last 7 days of sales, we see that more than half of our total sales were for the category of cigars. But the report and the chart show it as on 7~8% and shows sales for almost all other categories at the same percentage. The pie chart reflects this, as all sections are roughly equal.