Hm.. upon further inspection, it seems like when Ayu's chest is viewed at that angle [ugh, I HATE YOU Kazuyoshi Shimomura.] that tends to happen. It's interesting to note that every single photograph that is "reviewed" is done by the photographer.
And also, her boobs look fine from the front:
Obviously, Kazuyoshi is terrible at lighting the breasts at a correct angle. HIJIKA did it just fine with GUILTY. [that and his team probably LOVES to edit the photos afterward to make her breasts look freakydeaky.]
However, HIJIKA is somewhat "also GUILTY" but Ayu was raising one of her arms completely for this shot, so it's understandable.