Dashboard battery percentage differs from device--not updating?

Per the subject and a prior post suggesting a possible bug--both of my battery-powered door locks (working fine otherwise) report the battery level differently on the dashboard from the device itself. Given that I've only just noticed this, I can't tell how long this delta persists. Per each device's Events, it appears to report battery status every ~5 mins or so but, clearly, the dashboard isn't consuming that.

Two questions:

  1. what am I missing?
  2. what's the decorum here for filing (posting) suspected bugs?