On 23 July 2015, an ATR72-600 crew suspected their aircraft was unduly tail heavy in flight. After the flight they found that all passenger baggage had been loaded in the aft hold whereas the loadsheet indicated that it was all in the forward hold. The Investigation found that the person responsible for hold loading as specified had failed do so and that this failure had not been detected by the supervising Dispatcher who had certified the loadsheet presented to the aircraft Captain. Similar loading errors, albeit all corrected prior to flight, were found by the Operator to be not uncommon.