Nginx redirecting to port 8080, when we have no trailing slash

[pedrosimao]

I am facing a strange issue with Nginx config.
When I try to put url directly on the browser without a trailing slash, my url gets redirected to 8080 port, and does not take into account the relative paths.
Here is my Nginx config:

server {
    listen       8080;
    server_name  localhost;
    root   /app;
    include /app/next-routes.conf;

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /app;
    }
}

And here is an example of my next-routes.conf:

location ~ ^/dashboards/controlcenter(?:/)?$ {
    try_files /index.html /index.html;
}

location ~ ^/dashboards/controlcenter/404(?:/)?$ {
    try_files /404.html /index.html;
}

location ~ ^/dashboards/controlcenter/audience_builder/audiences(?:/)?$ {
    try_files /audience_builder/audiences.html /index.html;
}

location ~ ^/dashboards/controlcenter/audience_builder/manage_categories(?:/)?$ {
    try_files /audience_builder/manage_categories.html /index.html;
}

location ~ ^/dashboards/controlcenter/audience_builder/query_templates(?:/)?$ {
    try_files /audience_builder/query_templates.html /index.html;
}

location ~ ^/dashboards/controlcenter/audience_builder/title_lists(?:/)?$ {
    try_files /audience_builder/title_lists.html /index.html;
}