Hi,
It is easy, you installed an SSL certificate but did not properly redirected the page, both http & https versions are accessible, thus creating duplicates. You have lost 5 DA points just last week during the latest update. Add this code to your .htaccess page and wait until the end of the month for the next update:
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
Hope it helps!
