The pages for Yuusha Party no Kawaii Ko ga Ita no de, Kokuhaku Shite and its Web Novel version are both wrong, they should be: Yuusha Party ni Kawaii Ko ga Ita no de, Kokuhaku Shite mita (or however you want to combine the words). As can be seen from the japanese title: 勇者パーティーにかわいい子がいたので、告白してみた
It would be easier and faster to report the problem here: http://www.novelupdates.com/report-problem/
You can find it on your user profile on NU. Just click the user profile and the report form is the second button from the right.