A loose cannon on a ship doesn’t misfire. It moves with the roll of the waves and kills its own users and knocks a whole in its own ship. She is skimping on her script writers..
Yes, with each roll of the ship the cannon would careen
about the gun deck and since it weighed up to a ton or more
would eventually knock a hole in the ship.
Trying to tie it down was a very dangerous job but one
that must be done to save the ship. Kind of like saving
the ship of state from an unfettered Clinton...