Pose with two Sims, second Sim is Floating

I'm very, very new to S4S and Blender as well as making poses, but I've been lurking on the forums trying to find an answer to this problem and reading tutorials. To make this pose I was following along with this tutorial, but I'm only using two Sims, and they're sitting on a couch. I managed to figure out how to import a couch into Blender so I could pose them without just guessing how far to the floor they'd be, but then when I use the pose in game, the second pose (the girl) ends up floating above the couch. The first one (the guy) looks fine, though.

In Blender it looks like this:



But, when I pose my Sims in game using the teleporter mod, they end up like this:



I made this pose once before and then tried again, paying extra close attention to the tutorial, but it happened again, so I have no idea what's going wrong, lol. 

Here's my blender files on Google Drive (I don't know what all you need so I just added them all... they're having a conversation about having another child so don't mind the weird name, haha). I'm also using a Mac if that matters at all.

drive.google.com/open?id=1whgfMjJs0gKQ45AWg0sZ-wJDzidrJsIj

Thank you for any help!