It is compatible. Just a minor display glitch on a device that was not available at the time of the last update.
Version 2 was developed at a time where screen sizes on iPad always had the same number of pixels (except for the really old non retina displays). So it is no wonder that version has some issues here and there with display resolutions that where not available at that time.
The current version 3 can work on any screen size and will automatically adapt.