Looking at the “publisher metrics” for a couple of snaps I realized that they don’t add up.
There’s a “headline” figure above the graph, but the breakdown figures from hovering over the graph don’t add up to that headline figure.
Delving into the page source, that is because the headline figure is derived from the latest day (today it’s 2018-11-12), but the breakdown shows the figures for the day before (2018-11-11).
Perhaps there’s an out-by-one error in calculating the hover zones?