Asos design fuller bust bras, BNWT

I have 2, brand new, never worn, asos design racer back bras. Beige and black, beautifull design. First one is a 40FF, my breast were spilling a bit over but I loved it so much I decided to order another on in 40GG, but strangely the new one is too small band wise, fits like a 36-38 🤷🏼‍♀️. So one that is true 40ff and one that is really a 36-38GG