Solution is so simple nadlerz
The only "problem" is that you use plugin who generate XML on the fly.
You need to check your nginx settings
Location on server:
(/etc/nginx/ and /etc/nginx/conf.d)
(you can use WINSCP software for navigation)
open nginx.conf (if there's your
server {.....}
part for websites or go to conf.d folder and open vhost.conf
then find something like:
location ~* "\.(js|ico|gif|jpg|png|css|html|htm|xml |swf|htc|bmp|cur)$" {
or where you noticed that stands "xml" and simple delete this
location ~* "\.(js|ico|gif|jpg|png|css|html|htm|swf|htc|bmp|cur)$" {
After that you need to restart nginx with commands
nginx - stop
nginx
I hope that this guide help you.