Custom notifications/alerts inaccurately reporting


This is the second time in as many days that I have had something strange happen.
I have a custom alert for “fridge defrost” set to let me know if it’s been on for more than 30 minutes.
I’m getting notifications and alerts that don’t line up with the device power meter. It was on for less than 11 minutes this time and 13 the last but is triggering the 30 minute threshold.
Is anyone else experiencing this?