The Information page says this: "The Doujinshi, Manga, Artist CG, Game CG and Image Set sections should only be used for corresponding content that contain "hentai" or "ecchi" material. All non-H material should be posted as "Non-H"."
It's a self-published work, do it's doujinshi, no doubt about it. And it contains some ecchi material, which means it also doesn't go into Non-H.
Looks like someone doesn't know the definition of doujinshi.
@PeteParrot
Actually, non-H is ecchi. An "H-manga" is a pornographic manga. Yes, I know they call it that because "H" sounds like "ecchi" in japanese but that IS actually how it works.