Hi,
An editor created a sub-category which not no one can edit. Instead of using the folderPlus icon in the category dashboard to the left, the editor created the sub-category whilst processing a KB item request.
The wizard asked the editor whether to place the item in an existing category or create a new one, the editor chose to create a new sub-category. There was no setting of permissions like with a normal category addition and now it seems we cannot delete this through the standard way.
I have attached a screen shot, as you can see the action-orange arrow icon is missing.