Hello... I've just downloaded the app for the iPad today and noticed this taking place. I too think it is the app confused that I turned the screen tall, then wide. I don't think I switched out of the application to create this bug. I did look at the online guide for the app.
I have tried to change the orientation until it "matched" properly. (It started out on mine magnifying upside-down beneath my selected text.
I'm also using a bluetooth keyboard, not sure that matters.
Customer support service by UserEcho