I'm sure this is question already asked I just can't find it, I was noticing there were several books on the main wish list page that are on my bookshelf, same description and all. Why doesn't my books show up for the those lists?

could be a different version (pb vs hb or audio) or perhaps the isbn doesn't match

if people have that book listed they should get an email letting them know there is another version available

Your books probably have a different ISBN. If you want to see if you can get orders from them, go to the Book Bazaar and list them under the "Wish List books with Different ISBN" thread. You can also tag the WL book with a tag that says "Other ISBN: xxxxxxxx" so that people can check that ISBN when they look at the book.

Does the binding match and how many of your version are in the system already?  Check those out first.  If yours are all paperbacks with many copies in the system then people know they're there and don't want that version.  Usually is someone's WL large print or audio than that's all they want.  I have some James Patterson audio books on my WL that are plentiful in paperback.  So I would check that out first. 

If you have the same binding, just a different ISBN, than post them in the book bazaar.  You could even tag the WL version w/the ISBN you have posted to lead someone there.