The Calendar section (“heatmap”) of the stats on the desktop have a legend for the days of the week that is offset from the actual days. The heatmap itself is correct.
To illustrate, notice how I am hovering over what appears to be Friday according to the legend, but the tool tip correctly indicates that it is Saturday.
Note: the Sunday to Saturday arrangement is correct for my locale (US English); it is only the legend that is off.
Version 2.1.42 (8eebfe18) on macOS 10.13.6. The same problem also manifests on iPad with Anki for Mobile version 2.0.74 (20074.2).