Not really a bug or anything, but I think the girls need a second boob. (I mean it COULD be a bug, IDK.)
Lots of poses with the boob jiggle of most boob sizes reveals that none of them have a right boob, when the pose should be showing a second boob bouncing into view.
Easiest way to see this is via the cow, since even at default size she's big enough that the second boob should be visible.