I have dozens of unknown devices shown up, and the number keeps growing when I open the web page, but the number will reset when I refresh the browser, even after refresh, there still some unknown devices.
(I attached a third-party switch in L4)
Not sure if it’s related to the latest release, it just happened recently.
Currently experiencing this very same UI bug.
This seems to be the same issue conveyed over DM, regarding the list of expired devices/leases with cycling MAC addresses.
I have a Route10 right now with absolutely nothing plugged in on the LAN side, and I still have 6 clients in the Devices list. 
I literally have (3) wireless devices, and over 50+ expired leases that continue popping up on my UI sporadically. My concern are the expired leases building up db space. I would have assumed that these expirees would be purged from the db after x amount of time.
Interesting, it almost looks like an ARP poisoning attack. Is the 3rd party switch managed or unmanaged?
It’s managed. Any configs on that switch I can do?
Hard to say. The fact that the MACs are all almost the same with just one octet changed is what makes me question that, and it appears as though none of them are pulling DHCP, so that indicates something related to ARP. On the 3rd party switch, how large/full is the ARP table?
