Hmm, I have the same problem and the apps compatibility is 10.0 on iPad...
Is there an explanation for this from Slitherine?

I really enjoyed this game, however it has some serious issues still to be dealt with... One of the first things I'd like added would be an undo button. This type of option is very helpful in these types of games. Use for the prestige. What's the point of it? I'm hoping that a tech tree of some kind...