Otdfbt

I'm using nginx as my server. I have two domain names abc.com and xyz.com. Somehow I have configured abc.com to go to xyz.com but I cannot find where. I have a file under sites-enabled for each domain but the redirect is not there. I also checked nginx.conf and didn't see any redirects. Where can this redirect be coming from? Interesting thing is that when I remove abc.com server file from sites-enabled, I get the 404 error. The server file in sites-enabled looks something like:

server 
 server_name www.abc.com default_server;
 root /var/www/dev;
 index index.php;

 location / 
 try_files $uri $uri/ @handler;
 
 location @handler 
 rewrite / /index.php;
 
 location ^~ /html 
 try_files $uri $uri/;
 
 location ^~ /phpmyadmin 
 alias /usr/share/phpmyadmin;
 auth_basic "Admin Login";
 auth_basic_user_file /etc/nginx/dbms_pass;
 index index.php index.html index.htm;
 location ~ .php$ 
 include snippets/fastcgi-php.conf;
 fastcgi_param SCRIPT_FILENAME $request_filename;
 fastcgi_pass unix:/run/php/php7.0-fpm.sock;
 
 

 location ^~ /livehelp 
 try_files $uri $uri/ /livehelp/index.php?$args;
 location ~ /livehelp/.*.php$ 
 fastcgi_pass unix:/run/php/php7.0-fpm.sock;
 include fastcgi_params;
 fastcgi_param SCRIPT_FILENAME $request_filename;
 
 

 location ^~ /livehelp/operator 
 try_files $uri $uri/ /livehelp/operator/index.php?$args;
 location ~ /livehelp/operator/.*.php$ 
 fastcgi_pass unix:/run/php/php7.0-fpm.sock;
 include fastcgi_params;
 fastcgi_param SCRIPT_FILENAME $request_filename;
 
 
 # Denied locations require a "^~" to prevent regexes (such as the PHP handler below) from mat$
 # http://nginx.org/en/docs/http/ngx_http_core_module.html#location
 location ^~ /app/ return 403; 
 location ^~ /includes/ return 403; 
 location ^~ /media/downloadable/ return 403; 
 location ^~ /pkginfo/ return 403; 
 location ^~ /report/config.xml return 403; 
 location ^~ /var/ return 403; 
 location ^~ /lib/ return 403; 
 location ^~ /dev/ return 403; 
 location ^~ /RELEASE_NOTES.txt return 403; 
 location ^~ /downloader/pearlib return 403; 
 location ^~ /downloader/template return 403; 
 location ^~ /downloader/Maged return 403; 
 location ~* ^/errors/.+.xml return 403; 
 location ^~ /rfqnet/ return 403;
 location ~ .php/ 
 rewrite ^(.*.php)/ $1 last;
 
 location ~ .php$ 
 fastcgi_split_path_info ^(.+.php)(/.+)$;
 include snippets/fastcgi-php.conf;
 include fastcgi_params;
 fastcgi_pass unix:/run/php/php7.0-fpm.sock;
 fastcgi_param SCRIPT_FILENAME $document_root/index.php;
 set $MAGE_ROOT /var/www/dev;
 set $MAGE_MODE developer;
 

listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/www.abc.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/www.abc.com/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 
if ($host = www.abc.com) 
 return 301 https://$host$request_uri;
 # managed by Certbot
 server_name www.abc.com;

Where can i check to find the cause of this unwanted redirect?