When you are at an entrance to another area and facing away from it then if shoot your bow a couple times you will be pushed up against the entrance, but you will not go through, you will also not be able to move through until you back away from the entrance and go at it again.
This happens to both the clearing entrance and the cave, however if you just went through the entrance then shoot once it will push you through to the other side.
I'm not sure if this is a bug, but it's odd.