Well you for sure have a ghost if you weren't able to exclude and it still shows up. That might be gumming up the works if other devices are trying to route through it - can you power the device off and then try and remove from the Z-Wave details page by doing something like this:
Then click on "remove" if it pops up...
Also you mentioned "Z-Wave" devices not "Z-Wave+" ? There is a difference..
