No formatting on plugin page

Hey all,

I have a weird problem that I can’t figure out. I’m using the plugin “Job manager”. In my header.php I show 1 specific post, which on all pages/posts looks fine.

But when I go to the page where all the jobs are listed (mydomain.com/?page_id=18) suddenly the formatting for that post is gone, so no paragraphs and breaks. That page uses the page.php file, but on other pages I created, the formatting looks just fine.

Anyone has an idea? Thanks!