Because of the power failure at factory A, we afraid products can not finish on time.
We would like to retain the vessel that we book before, and order one more vessel for safety purpose.
Factory A is worried that, due to power outage, they may not be able to ship the goods out in time. To play it safe, they decided to keep the original cargo's reservation date, and place a new contract for another reservation.
perhaps because a factory cuts power misses produces goods, stable in order to, before still retained, subscribes the scheduled ship time, moreover again order another scheduled ship time.