Some posts not displayed right after HTTPS migration(CSS?)

Hello,

Some of my post, not all of them, are displayed like below picture. The layout is completely gone.

It looks like it cant proper load CSS or something like that. Yesterday i switched from HTTP to HTTPS, i dont know if it has something to do with that. I added the below code to my htaccess file to activate my SSL certificate(it was already instsalled by my hosting provider). After that i changed the URL’s in my WP dashboard. Then i had to clear the mixed content and added a ‘S’ to some of my images and links in my database, just 3 or 4.

RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !http
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Can somebody help me out? Its super annoying. Thanks!