Inspecting your site it have mixed content:
http://XXX.XXX.XXX.XXX/wp-content/uploads/2020/01/logo.jpg is served via HTTP.
To solve the mixed content issue you need to replace all the image links which use HTTP to HTTPS. You can either do this manually, or install a plugin that does this for you.
You should also change your
/opt/bitnami/apps/wordpress/wp-config.php to use https as below
define('WP_SITEURL', 'https://' . $_SERVER['HTTP_HOST'] . '/');
define('WP_HOME', 'https://' . $_SERVER['HTTP_HOST'] . '/');
I hope it helps