User blog comment:B214/Question & Answers 5/@comment-3965848-20150620061640/@comment-16281343-20150620073234

Not their fault to be honest. The two were introduced as Nekomusumes which are just characters that act as girls. So, they just did what was presented to them.

The same with what happened with Ravel's appearance in Season 1. IIRC, Miyama's mistake was also the reason why her breast were animated small; with which they corrected in Season 3.