Redundant Forum Sections

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In the "Forum" view, why are there two different sections for "Advanced Topics"?

Is this a misconfiguration?

It looks as though there's a category and a subcategory both with the same name and both with (a different set of) posts in them. My wild guess is that the subcategory was meant to contain the posts and the category was meant not to have any, but it's only a wild guess.