Nginx is proxying the request to Django(maybe uwsgi) for you, so any request that reaches Django will look from localhost.

Change nginx config: 

location / {
    proxy_pass http://frontends;
    proxy_pass_header Server;
    proxy_redirect off;
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Scheme $scheme;
    proxy_set_header REMOTE_ADDR $remote_addr;
}

and in django can get real client ip :

ip = request.META.get('HTTP_X_FORWARDED_FOR') or request.META.get('REMOTE_ADDR')