We’ve found, from previous forum threads, that other plugins registering post types are doing it wrong, which can cause this and similar issues.
Although you mentioned (and provided a video) that you tried deactivating other plugins and still had the same problem, however I notice you’re using CloudFlare, which would still be serving the cached version after they were deactivated.
Again, deactivate all other plugins, and be sure to clear your CloudFlare cache (or temporarily disable it for troubleshooting).