If a schedule runs when a device is offline, Event History reports the wrong time. Instead of the actual time, it says each zone ran at the moment the device came back online.
That said, if the device goes offline and back online, that seems like something that is also worth knowing about, as long as it doesn’t flood the event log.
It is helpful to know if a device is going offline a lot because the WiFi signal strength might appear okay, RSSI -62 in this case, but it’s glitching for other reasons like router issues.