Plane falls off carrier!

Sorry if already posted, I didnt see anything very clear.
When on the deck of a moving carrier, parking brake on and everything, the plane seems to just sit in one place, while the carrier continues to ove under it, then the plane falls off the back of the ship! Anyone have this issue, and/or know how to fix it? Thanks
When on the deck of a moving carrier, parking brake on and everything, the plane seems to just sit in one place, while the carrier continues to ove under it, then the plane falls off the back of the ship! Anyone have this issue, and/or know how to fix it? Thanks