I think that the "Recently Added" isn't working properly (this is in there, and this was added 2 years ago)
Recently added refers to stuff just added to the reader, while the date on the manga is when it was released by the scanlator. So while this doujin was translated 2 years ago, it was only uploaded today.
That's the reason for the Recently Added section, so you can see stuff that was uploaded that wouldn't otherwise be on the front page.