Change the link of the nav

Hi there Little problem with the nav at the end of my article just for one, for the first of my page "création", when u click at the right at the end "NEXT" you are going to the next page and not the next article. How can I change this, because I don't have this problem after for the next articles. This is the page : http://dizamosaiques.com/les-miroirs-rode/ Thanks a lot