I just sent a testflight of my app to my customer for testing and they all came back with the same issue, and shared the screen shot below.
Reading through this message, I have implemented the nav-clear in my buttons (all of which are tags that call a method on the state object in the controller $state.stateManager where I then do some processing (saving the data to local storage) and then use a $state.go() transition. I have not been able to replicate the problem since applying the nav-clear attribute, but then I was not seeing it on my app while running in XCode so I am not sure if this is a fix.
Looking over this thread and others on Stackoverflow it seems to be related to just iOS. I am running iOS 9.1 (13B143) and ionic 1.1.0 with the iOS9 patch and radiobutton patch.
I am going to resend this to my customer and see if they can replicate the issue and will update here accordingly. If anyone else finds a definitive answer, please let me know!