Well yea as I said in FA, the sprites are misaligned. Did you use onion skin? Or next time try to make a ground by using a line tool or something so that you'll prevent the misalignment.
They aren't misaligned. Just because the animation doesn't stay on one straight line doesn't mean it's misaligned.
If the sprites were moving up and down/left and right (so that the sprite seems to be 'shaking') then it would be misaligned. This simply gives the effect that the animation has multiple platforms, or that the stage has depth.
Serious, there's really nothing wrong with this animation.