I had several โghostsโ as you describe. No clue really where they came from. I had to try removing them several times. I also rebuilt the zwave network several times. After continuing to try and several reboots, they did eventually go away.
@gopher.ny - you might be interested in what I found:
I had to switch back to the legacy z-wave, then refresh, then remove.
I had to shutdown/poweroff/reboot between removing the two of them.
That finally got rid of them--so there does appear to be something out of whack with the ZWJS stack that impacted this. But, they seem to now be gone, finally.