I’m seeing a similar pattern of transition alerts between Standby and Off with a couple of my smartplugs (HS110 and HS300) here.
If I look carefully at the device timeline for my Washer (on an HS110), when I look closely at an alert like this
I find that there is typically a short 1W bump, like below, that has precipitated the alerts.
Here’s the same view of that “bump” from the raw 4 second sampling data from the same HS110 that Sense is getting its data from. A detailed vie (17:20 = 5:20PM)
And a broader view over time.
I can see how some kind of moving average (smoothing) of the data together with rounding could trigger the brief bump to 1W that caused the Off to Standby transition and subsequent Standby to Off.