Are these on the same device? (Cloned Lines?)
They don't register at the same time, so it could have been a blip in your ISP.

Was it back on vPanel wthin, ... say, a few minutes?
Maybe your router renewed its lease recently?
Just brainstorming, not sure on the actual technical facts.

I expect the devices web page queries the VOIPo database for the list of devices when you click the link.