I have a website: https://oakreef.ie/

It has a self-hosted comments section that uses Comentario which is exposed at: https://comments.oakreef.ie/

This seems to work consistently fine on my desktop (running Manjaro) in both Firefox and Chromium but on Fennec (Firefox fork) on my phone and also on Chrome on my work laptop (Windows 11 🙁) sometimes the https://comments.oakreef.ie/ domain just redirects back to the main page instead of the Comentario dashboard and when this happens the comment section stops loading entirely because the subdomain is directing to the wrong place.

I site is just hosted on a server I rent that’s running Ubuntu through an Nginx reverse proxy. I assume that the problem is with Nginx but I am not sure and I find configuring Nginx confusing. I have just pasted the full configuration here which I don’t think contains anything that I shouldn’t post publicly but do please tell me if I fucked up posting it too lol.

##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# https://www.nginx.com/resources/wiki/start/
# https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/
# https://wiki.debian.org/Nginx/DirectoryStructure
#
# In most cases, administrators will remove this file from sites-enabled/ and
# leave it as reference inside of sites-available where it will continue to be
# updated by the nginx packaging team.
#
# This file will automatically load configuration files provided by other
# applications, such as Drupal or Wordpress. These applications will be made
# available underneath a path with that package name, such as /drupal8.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##

server {
    root /var/www/oakreef.ie/html;
    index index.html;
    server_name oakreef.ie www.oakreef.ie;
    error_page  404  /404.html;

    location / {
        # redirects
        include /etc/nginx/conf.d/oakreef.ie-redirects;

        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        try_files $uri $uri.html $uri/ =404;
        add_header Cache-Control "public";
        add_header X-Robots-Tag noai;
        add_header Permissions-Policy 'fullscreen=(self "https://www.youtube-nocookie.com")';
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/oakreef.ie/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/oakreef.ie/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}

server {

  server_name comments.oakreef.ie;

	#listen [::]:443 ssl ipv6only=on;
	listen 443 ssl;

  ssl_certificate     /etc/letsencrypt/live/oakreef.ie/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/oakreef.ie/privkey.pem;
	include /etc/letsencrypt/options-ssl-nginx.conf;
	ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

  location / {
    proxy_pass http://127.0.0.1:5050;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_cache_bypass $http_upgrade;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection keep-alive;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-Host $server_name;
    proxy_buffer_size 128k;
    proxy_buffers 4 256k;
    proxy_busy_buffers_size 256k;
		add_header Cache-Control "private";
	}
}


server {
    if ($host = www.oakreef.ie) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = oakreef.ie) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    if ($host = comments.oakreef.ie) {
				return 301 https://$host$request_uri;
		}

    listen 80 default_server;
    listen [::]:80 default_server;

    server_name oakreef.ie www.oakreef.ie comments.oakreef.ie;
    return 404; # managed by Certbot
}