Great App but recently is showing me wrong info

Hey guys,
I used this app for quite a while now and I think its great. Just recently it started showing wrong information. Wrong price, number of books and especially wrong ranking number. Not only that but it does not find more than half of the books.
I got tricked with it and bought wrong books. Please address this issue, I want to continue to use it.

Thank you

Pushro about iBookSeller