In admin, two sets of grandchildren categories whose descendants extend three further levels (to the 5th level in total) are missing from editing capability, even tho they appear elsewhere in admin. For example, I can see those two categories and their descendants when playing around with "add category." Further example, I get error the categories already exist when I try re-adding them. Why a problem: I want to edit one of these family members into a different parent category. If this 5-level depth is the bug, I can adjust hierarchy, tho I need a way to edit. Namely, the two problematic categories are entirely missing from editing, as already stated. All categories publicly display on my blog. For example, on the public home page, I can search by the two categories or their descendants.