WordPress Admin Bar and Preview not showing

Recently I’ve been fixing my SSL Certificates and mixed content errors but now it seems maybe wordpress front end and back are working on different SSL Certificates or something as the admin bar no longer appears at the top of my site when logged in and when I go to previous a post, it comes up a 404 error.

I’ve got a SSL certificate through my domain, there’s also Cloudflare running over the top of it.

The page I need help with: [log in to see the link]