Try this
clear your browser history and check

You should use a reverse proxy for SSL termination, you'll find a deployment example with nginx proxyserver in the documentation: https://www.odoo.com/documentation/11.0/setup/deploy.html#builtin-server

I prefer using the caddy server (https://caddyserver.com/), because it is very easy to setup and configure and offers automatic SSL using free Let's Encrypt-certificates.

This is an example of the caddyfile (vhost definition) for my website (it is caddyserver version 0.95, newer versions are slightly different), but you see how easy it is compared to the nginx vhost definition:

twanda.com,
www.twanda.ch,
www.twanda.com,
www.twanda.twanda.ch,
twanda.twanda.ch   {

  cors
  proxy / http://xxx.xxx.xxx.x:8069 {
    transparent
    header_upstream X-Forwarded-Host {host}
    }
  log /var/log/caddy/twanda.access.log
  errors /var/log/caddy/twanda.error.log

  timeouts 720s

}