Wrong Blog display !

Good day,
On my website I have different categories in my menu. Each category is a blog of it’s own. each one used to show correctly until suddenly it changed to showing “Archive
Category Archive”. no matter how i change the page display settings into blog classic or anything else it doesn’t have any effect on how the page looks like.
For example all the blog pages looked like this http://www.favoriteknowledge.com/live-smarter/
Now all the other blog category pages look like this
http://www.favoriteknowledge.com/food/
Please i need help to fix this issue.
Thank you