Device doesn't show up again on devices list after delete

Hi there, I've deleted some devices on Firewalla iOS app from devices list, and it should reappear when it reconnect to the network right ? (I had done this couple months ago and it was working fine...)

The devices I deleted didn't show up on devices list for some reason...

So, yesterday to perform another test and make sure about this issue, I deleted my own cellphone that manages the Firewalla app, and manually disconnected it from my network and reconnected after couple minutes and it didn't show up on devices list...

I tried to reboot the box, router and nothing !

Follow the information about the box:

Firewalla Blue (Beta program)

Box Version: 1.966

App Version: 1.36 (40)

Thank you!

EDIT: Well, my own phone just reappeared in the list as iPhone (I found it and double check the IP Address to make sure it was the phone I deleted!), but I didn't receive the notification of new device !

And after persist in shutdown the entire network, all devices started to reappear on devices list!

The only thing now is missing is the notification popup of new device found!