Currently the default in and out animations use -50 offset. This does not consider different densities. For example on my device the height of the view is 58px. So 8 pixel will not be animated and it will result in a jump.
This specially affects custom views, since the height there can be any size.
I already got this fixed here and will send a pull request in a few minutes.
Fix: Use height of crouton view for animation (fixes #90)
Thanks for the pull request. The solution will up with version 1.8.