Hi,
We'll look into this issue. Which generation iPad do you have?
All Leanpub books include free lifetime updates, so when it's resolved you'll have a free update. (You also get free updates if the author updates the book for any reason, like adding new content, etc. We believe in self-publishing in-progress ebooks, so that you can iterate on your book like you would a startup. We call this idea lean publishing.)
Also, we have an unconditional 100% refund policy, so if you're unhappy for any reason just forward your PayPal receipt to hello@leanpub.com and we'll refund your money.
Thanks!
Peter, Leanpub co-founder