Not just Catalunya but a number of kerbs, there are some in Hungary that do the same if the wheel rides the kerb whilst turning in...round you goare you refering to at catalunya because if so i did a replay at the second left hander after the short shoot drs and the reason you spin when you hit that curb is the left rear wheel comes off the ground so very realistic
most likely you are hitting the curb wrong and upsetting the car
as i use the curbs liberally and thats the only spot i ever have a problem with