In the Connected Devices page, it shows at the bottom older connections that are no longer active. How long does it take before they disappear from there? Also, is there a way to clear them besides a factory reset?
I found out how to get rid of them. Reboot the gateway device. I got to my PC this morning to see that all my connected devices were empty. I rebooted the gateway from the Troubleshooting menu while logged in. It got rid of every device except those I had added a hostname and static ip.
Also the renaming of the devices on the Connected Devices page in my other thread was related to my old modem. I got a new one and all devices are keeping the hostname I added when I gave them an IP.