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I even googled it a couple different ways to see if I coul figure it out. I've seen that myself and wondered.
My best guess is that "substores" is a generic term for "sub-genres". Although, why it shows up sometimes in the genres as an actual word, I couldn't say.
I think I figured it out.
One place you see "Substores" is when you are looking at the genre of books on a bookshelf.
For example, a book will say "Literature & Fiction, SubStores"
When you click on the book to go to the book description, it is listed in multiple sub-genres under Literature and Fiction.
So, I think "Substores" is just what is says in certain places, as shorthand for "This book is listed in multiple sub-genres under this main genre"