When trying to delete a Level Name, then I get the following messages:Error
Save failed with the following error: Level with the name "Registered" already exists.
Warning
You can't delete the view access level '3:Special' because it is being used by content.
The web site is running Joomla 3.10.1.Error
You can't delete the view access level '3:Special' because it is being used by content.
When testing on another web site also running Joomla 3.10.1, then the above behavior is repeated. This make me believe it might be caused by a bug in Joomla. I can't say for how long this issue has been present, since this has been untouched for some time.