Musk: We have one landing in stormy seas where only thing the kept rocket from falling overboard as it slid around barge was lip on barge.
It seems that one and probably two legs have compressed crush cores allowing a good pendulum teetering action to develop and increase in amplitude by further compressing the cores with the continuous rocking on deck. That bigger teeter caused incremental sliding toward the most compressed leg with each jarring stop, arrested only by the yellow I beam railing around the deck edge.Whoever first came up with the idea for that railing around the ASDS deserves a serious attaboy from Elon. That saved the rocket from walking overboard.