Blog page issues

Hi there,

I want to upgrade my site from sydney 1.41 to 1.43 version.

Here is my page on my production site in 1.41 version :
http://www.coursedeloriente.fr/actualites/

When I upgrade to 1.43 version on my local server you can see the result there :
http://www.coursedeloriente.fr/wp-content/uploads/2018/01/Blog.jpg

I selected the classic style not the alternative.
I have some issues (in the circles):
1) The breadcrum appears twice,
2) The police of the post title has changed
3) The publication date of the post is in english not in French anymore.

How can I fix theses issues.

Thanks for your help.

Caherine.