Sorry for the late reply guys,
That is the correct behavior of how EaseInBack, EaseInBounce etc works.
I'll try to explain EaseInBack and EaseOutBack using ordinary words.
So in height tween of EaseOutBack, it works by making its height bigger, then it will exceed 68 pixel, after that it will return to the 68 pixel with.
In height tween of EaseInBack, it starts by making its height smaller, then grow its height bigger until it reach 68 pixel.
I made a simple example here:
https://dl.dropboxusercontent.com/u/553 ... anged.capx
Are you sure you don't want EaseOutBack instead?