I'm not sure, but I think it has something to do with the collision masking or the image and/or the origin point because of the way it interacts with the catapult.
The physics behaviour on the player pulls it to the floor, but the catapult is supposed to prevent this.
It is a tricky one,but im sure its a simple fix, once its found.... let me know if you cracked it.
I plan to sort it eventually, but it only appears on one layout for me, so decided to leave it until beta testing to sort it.