Problem link with featured post

I’ve got a problem with the “featured post” bar navigation : I chose a specific category to have my articles from this category in my home page. The article is the right one on my home page but when I click on “read more” the link is wrong. It goes to the last post I wrote and not to the article I want.

Can someone help me ?

Thanks.

Here the link of my website (french website, the read more is “lire la suite”) : http://vivonscurieux.comxa.com/