There is a bug.
I have three categories.
Cat 1 Cat 2 Cat 3 Each cat has roughly 20 sub cats. These are all the same in each Category.
If you click on categories on the home page you see the three categories laid out with three subcategories under each.
Then say if you click on the first Category, in the refine results box you have the first Category at the top and then you have the second category title under it. Then you have all the sub categories.
However if you scroll down the refine results list to the last sub category before you would normally see the second category title it is not there. It start the sub categories again. I am guessing this is because the second category title is directly under the first category title at the top of the refine results box.
I hope you understand that lol