The problem is because the image is loading from www.gallereplay.com/blog/ some file (with a 301 redirect) to blog.gallereplay.com/some file, hence that redirect is not https.
You could add the following code to your .htaccess file to force https (if visiting from HTTP, would be redirected to https version)
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]