If you have an "Update Firmware" button at the top of that page, do the firmware update before doing anything else! It will make it work a lot better.
All those devices that say "Discover" are a ghost node, not connected to anything.
Do you have any actually paired devices that do not say Discover and have a route?
If there are no paired zwave devices, the full radio reset will get you back to a clean slate.
If you DO have paired and functioning devices, you will need to go through each of the ghost nodes, and click "REFRESH", let the page refresh, look for a remove button. Click the remove button ONCE, let it do its thing. If you are lucky it will remove. You may need to do it a few times before it goes away. If it seems to get stuck and wont do anything anymore, try the full power down and reboot again.
Once you get rid of all the ghost nodes, then reassess your devices. Anything no longer paired, you should be able to pair now with the mesh sorted out.