2009 Toyota Prius Fuel System Other Problems

I WAS SITTING ON A ROAD IN TRAFFIC WITH MY CAR RUNNING BUT IN PARK BECAUSE I WAS WAITING FOR A TRAIN TO PASS BEFORE PROCEEDING. THE CAR JUMPED FORWARD WHEN THE VEHICLE CHANGED FUEL MODES FROM THE ELECTRIC ENGINE TO THE GAS ENGINE. I ALMOST HIT THE PERSON IN FRONT OF ME. WHEN I CONTACTED THE DEALERSHIP SERVICE DEPARTMENT AND HAD THEM CHECK THE CAR THEY TOLD ME THIS WAS NORMAL. NO ONE EVER INFORMED ME OF THIS WHEN I BOUGHT THE CAR. THIS IS A HAZARD IN THE ABOVE SITUATION AS WELL AS IF PEOPLE HAVE THEIR CARS IN THEIR GARAGE AND RUNNING OR IN A NUMBER OF OTHER SITUATIONS. *TR