Deleted Roles Still Assigned to Users
After admin deletes some roles, they are still assigned to users. This is especially the case after upgrades or imports. There is no way to access those "deleted roles" and remove them from users.
These "deleted roles" remain invisible in the dashboard, but are still assigned. The only way to access them is to do manual database manipulation.
However, when new roles are created, sometimes they are assigned the same IDs, and then users with those role IDs previously assigned to them in the past (before upgrading, importing, etc.) are now given the new roles.
There should be a utility to purge old roles from users.