@justforthelulz—
There are multiple conventions in labelling. The uploader probably follows a different convention from that which
currently prevails on MangaDex. MangaDex is going to change its convention in the future, to one
isomorphic to that used by the Japanese, but it won't actually be using “Yuri” as a label.
Of course, I wouldn't be surprised if, at some point after they switch to “Girl's Love” (which ought of course to be “Girls' Love”, but
admins gonna admin), there is an campaign to add back “Yuri” as a tag, and maybe “Shoujo Ai”.