get_template_part: Don't show HTML code

I’ve buy and installed one template that used the “get_template_part”.

In my LISTING PAGE for the category, in the archive.php file i’ve :

while( have_posts() ) { the_post();
                    get_template_part('content', get_post_format() );
                }

I’t work, but the output is without the html code.
I see the page without: bold, br, and the other tag..

Why?

THIS IS THE POST PAGE
https://www.cinepiucorreggio.it/2013/01/cloud-atlas-3_67

But in the listing page, with the “get_template_part”, i don’t see the BR and the BOLD tag.
LISTING PAGE
https://www.cinepiucorreggio.it/film/programmazione

Is there anyone who can help me?
Thank you