Regular C8 or Pro? If regular C8 can we assume you are on the ZIP gateway (not Zwave JS)?
You may just need to wait a couple days for the mesh to settle down after removing multiple repeaters. Not sure how long ago you removed them and the ghost nodes?
Z-Wave Issues For partial or total loss of Z-Wave control (radio seems dead), before doing anything else please shut down the hub from settings and unplug for 30 seconds, then re-plug to boot back up. This will allow the radios to fully power down and restart. A regular reboot only restarts the platform and not the radio hardware.
Hubitat Docs: Z-Wave Details Hubitat Docs: How to Troubleshoot Z-Wave
How is Hub being powered? Supplied power block or other (explain)
PoE power (with splitter) is known to cause major Z-Wave issues on the C-8 hub.
See this post for detailed write up on PoE testing: PoE and the C8
Provide screenshots showing entire Z-Wave details Page
Hub should be running for at least 12hrs without reboot, and state how long in your post (you can find uptime on Logs > Device Stats)
Click the Refresh Statistics button, wait 10 seconds, then Refresh the page
Provide screenshot of Z-Wave Topology Map (red/blue squares)