535cc, under muscle, Mentor, UHP, breast implant size and position? What's happened? (Photos)

I had a bi-lateral breast augmentation on 25/09/23, with Mentor Siltex Ultra high profile 535cc implants under muscle. The R breast is 2 cupsizes smaller than the left but has thicker breast tissue mass as per Mammogram images. Why please? Whats happened? This has been the result since waking from surgery, it hasnt happened overtime or suddenly changed in appearance.