I think I spotted a minor bug in VRM, not crucial but something for the VRM elves to take a look at when they next touch the VRM code.
Look at the difference between the graphs for "this week" and last two days below.
The "this week" plot has gaps in the data plotted, whereas the last two days (and most other graphs) show continuous data.
This is the same on MACBook Chrome and Safari so apparently not a browser artefact.
Regards Laurence