Something wrong...
0
yurixhentai
desu
You're right.
There's a spelling difference between this doujinshi and the ones you posted. One doesn't have an exclamation mark but the others do. But when you click on the series name of either those with an exclamation mark or the one without, they all lead back to the one without. In other words, the ones with an exclamation mark are being directed to a list without the exclamation mark (which is just one doujinshi), but they're not linked with that list.
There's a spelling difference between this doujinshi and the ones you posted. One doesn't have an exclamation mark but the others do. But when you click on the series name of either those with an exclamation mark or the one without, they all lead back to the one without. In other words, the ones with an exclamation mark are being directed to a list without the exclamation mark (which is just one doujinshi), but they're not linked with that list.