Wrong order

Hello,
I want to use hungryfeed to show on my page the Top 20 free ebooks from Amazon. My problem is now that the order is completely mixed up. It starts with the book on place 7, the place 1, then 5 and so on.
Am I doing something wrong?

I use this link: http://www.amazon.de/rss/bestsellers/digital-text/530886031

Can you help me with this problem?

Thanks a lot!

https://wordpress.org/plugins/hungryfeed/