Click refresh once, wait for page to refresh. Check for Remove button, if not there try refresh again. If you have Remove click that once and wait. May want to have logs open on another tab. Hopefully remove will actually remove them.
Sometimes if you get stuck on refresh or remove not working this helps: shut down the hub and pull power for 10 seconds, then start up again. Then wait a minute or two and try again.
There is entire thread dedicated to this: How To: Remove Z-Wave Ghosts using a UZB Stick
