Compute the actual distribution of all metrics for dashboard

The lighthouse CI server's distribution graphs for categories (Performance, Accessibility,...) are not showing the number of examples rightly. I ran the lighthouse CI against the same URL across two different builds and so I got two entries in the "runs" table of the DB. But in the dashboard, the number of examples is shown as 6 instead of 2 with duplicate entries, whereas it is correctly shown for the performance metrics such as Speed Index, First Contentful Paint, and Time to Interactive. I also had a view on the "statistics" table of the DB, it had only two entries, one for each build.

I have two questions.
1. Is this a bug or an intentional one?
2. What happens if there are multiple runs (eg. 3) of the same URL in a single build? Will the median be used in that case for categories and performance metrics in the graphs?

Please find the image below.