Bug in the browser with ssl?

Question

Nginx

There are 2 domains, one has SSL installed
pg.whata.ninja and https://whata.ninja/
On the first one there is no ssl certificate, on the second there is,
So, after I go to the main domain, the second one (pg.whata.ninja )
starts to request ssl from the server, but if you don’t go to the main one, then everything is in order,
is it being treated with something?
whata.ninja in nginx

server {
    listen 80;
    listen [::]:80;
    server_name whata.ninja www.whata.ninja;
    return 301 https://$server_name$request_uri;
}
server {
    listen 443 ssl;
    listen [::]:443 ssl;

    root /var/www/whata.ninja/public;
    index index.php index.html index.htm;

    server_name whata.ninja www.whata.ninja;
...

pg.whata.ninja

server {
    listen 80;
    listen [::]:80;

    root /var/www/pg.whata.ninja/public;
    index index.php index.html index.htm;

    server_name pg.whata.ninja www.pg.whata.ninja;
...

Answer 1

The config is incomplete. You probably give HSTS ))