If you go to the Skins tab on the store and sort by Champions, switching between alphabetical and reverse alphabetical will add copies of the champion headings.
1. Log in and go to the Store
2. Go to the Skins tab
3. Sort by champions (which puts them in alphabetical order)
4. Click sort by champions again, which puts them in reverse alphabetical; this creates 2 champions headings for each champion.
5. Click sort by champions again - there are 3 champion headings for each champion.
6. Can be repeated to create more headings.