There are some strange things happening on my Joomla! 3.8.2 site. It appears that a page exists which lists all categories.
However, there is no Menu Item made for this. This URL is a Menu Item Type "Menu Heading" under which there are grouped some other Menu Items. So this should be a Menu Item Type of "Menu Heading", not a Menu Item Type of "List All Categories".
I wonder how this could happen, and how I can correct this issue?