Some serious questions to be asked.
Full aft is concerning.
On 29 October 2015, an Airbus A321, registered VH-VWT and operated by Jetstar Airways (Jetstar), was scheduled to conduct a passenger flight from Melbourne, Victoria, to Perth, Western Australia. During the take-off roll, the pilot flying noticed that the aircraft was nose-heavy and required an almost full aft control input to raise the aircraft’s nose. Once airborne, the flight crew requested the cabin crew to confirm the passenger numbers and seating locations. The flight crew re-entered the updated information into the flight management computer and identified that the aircraft was outside the aircraft’s loading limits for take-off and landing. Passengers were relocated within the aircraft cabin to return the aircraft to within allowable limits for the remainder of the flight and landing.