Can't remove devices from Xfinity WiFi Hotspot Connected Devices list

I am unable to remove devices from the Xfinity WiFi Hotspot Connected Devices page at this link: https://customer.xfinity.com/#/settings/security/hotspot-devices

When I click on remove it then shows a green checkmark and "Your device has been removed successfully." at the top of the page, but the device is still on the list.

Renaming the devices also doesn't work, but that's much less of a concern.