I believe it has to do with the flap. Our flap has two magnets at the bottom and he doesn't like that it retracts back if he doesn't fully commit to sticking his head through. I tried removing one of the magnets, but he's still hesitant. He pokes at the flap to see if it'll close on him, but I don't want to remove the magnets. It keeps the flap closed and helps with insulation. How do I get him to fully commit! lol