It looks like you have unzipped each of the content folders into its own runtime and added them each as an external library. The name of the runtime will appear in each of the content categories (character, pose, face, etc), regardless of whether there are items of that type in the runtime. 

Going on that assumption, the screen cap you show above shows that you have the character library selected. You'll notice that the first five legacy content packs have sometihng in the character library. But when you get to the sixth, it is a hair runtime and the associated content will appear under the Hair category.

Going further down, the 07 runtime has clothes in it. Because it is showing 0 in the character library, you will probably find the clothing in the Props library for that one.

You haven't done anything wrong here, it's just how Poser works.