Patience is the key. You may have to do a shut down reboot to clear the radio up. Boot up and let it chill for a few minutes. Go in and hit refresh once, let it reload the page, if no remove button try again until you get one. Once you get the remove button click it ONCE and then just wait a few minutes. Come back and refresh the page, see if it is gone or what it looks like.
If all else fails you may need a USB stick to remove them: How To: Remove Z-Wave Ghosts (including using a UZB Stick)
