Hello @stranny00,
Thanks for writing to us.
It seems that the URLs are not fully replaced while moving the site from an HTTP site to an HTTPS site and that causes the Mixed Content issue [ HTTP and HTTPS ] and just because the page builder is not working.
I would suggest you replace the URL properly and check this again, there are many URL replacement Plugins available in WordPress which help you to replace the URL.
This article will be helpful in this:https://www.wpbeginner.com/plugins/how-to-update-urls-when-moving-your-wordpress-site/
Also, remember that the exact URL should be mentioned in Setting > General, WordPress Address and Site URL, including the protocol i.e HTTP/HTTPS.
Hope this helps.
Thanks