Mine states the same, that´s the gross weight of the car i.e. the maximum operating weight of the car which is the total of the vehicle's chassis, body, engine, engine fluids, fuel, accessories, driver, passengers and luggage weights.
I plan to do a thorough inspection after Easter, car is hibernating in a nice warm Swedish barn at the moment, should be able to see if there is any obvious reason for the weight as soon as its up on the lift. /Paul