Nginx proxy pass not rendering - nginx

Question

I'm trying to serve some services as a subdomain but it looks like nginx is not doing it right.
I have 3 docker containers serving zabbix, webmin and mediawiki.
example.com/zabbix (works fine)
example.com/webmin (not rendering)
example.com/wiki (not rendering)
server {
listen 80;
server_name example.com;
root /var/www/html/;
location /zabbix {
proxy_pass http://192.168.0.71:8081;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /wiki {
proxy_pass http://192.168.0.71:8080;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /webmin {
proxy_pass http://192.168.0.71:10000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
Also add in /etc/webmin/config:
webprefix=/webmin
webprefixnoredir=1
and LocalSettings.php
$wgServer = "http://example.com";
$wgArticlePath = "/wiki/$1";
$wgUsePathInfo = true;
wiki pages and webmin looks weird:
wiki screenshot
Any help will be appreciated
thanks!