Little thing that has always annoyed me (but not enough to report as it is not a bug I guess!) is that on the last 7 days rhr graph seems to have max and min that is a multiple of 5 (my current graph has min value of 55 and max value of 60) but the scale only has 3 lines rather than the 4 needed!
This makes each line a decimal value. In my case each line relates to min(55), 56.25, 57.5, 58.75, max(60).
I know it's not a big issue but I guess the guy who designed it was not the best mathematician as they really didn't think this through as it needs an extra line to fix my ocd...