Incorrect RSS numbers

Hi,

I found that in the syndication page, numbers in brackets are incorrect for categories that include other categories (father-child relationship). For instance, in the attached picture, "Attualità (5)" and "Dalle regioni (6)" include all following categories, but "Attualità" content 3 items itself, and "Dalle regioni" nothing itself. All others categories (child) display correct numbers in brackets.