Hello mamekoma, There are several meanings to a technical problem. In this case, there seems to be an overtone of sexual assignment and young children. So this might be accepted as something that fits in the editorial Adobe section. These renderings have a very different process of review and acceptance of Stock.
A second reason might be the very fuzzy edges of each sex-symbol. Kids are cute and might pass even though there are unsmooth edges.
It is better for you to inform yourself about the guidelines and definitions of rejection terms. Here are a few for you to study. Kind wishes for your success. JH