service nginx stop not working on one server but works well on another

Both are CentOS servers.

Server A:

After running service nginx stop, the Nginx processes are killed.

ps -aux | grep "nginx"
root      1729  0.0  0.0 125600  6488 ?        Ss   Sep15   0:00 nginx: master process /usr/sbin/nginx
root      2240  0.0  0.0 125604  5744 ?        S    Sep15   0:00 nginx: worker process
root      2241  0.0  0.0 125604  5752 ?        S    Sep15   0:00 nginx: worker process
root      2242  0.0  0.0 125604  4100 ?        S    Sep15   0:00 nginx: worker process
root      2243  0.0  0.0 125604  5748 ?        S    Sep15   0:00 nginx: worker process
root      2244  0.0  0.0 125604  4100 ?        S    Sep15   0:00 nginx: worker process
root      2245  0.0  0.0 125604  4304 ?        S    Sep15   0:00 nginx: worker process
root      2246  0.0  0.0 125604  5744 ?        S    Sep15   0:00 nginx: worker process
root      2247  0.0  0.0 125604  5744 ?        S    Sep15   0:00 nginx: worker process
root      2248  0.0  0.0 125604  4044 ?        S    Sep15   0:01 nginx: cache manager process
root      3705  0.0  0.0 112708   988 pts/0    S+   21:15   0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn nginx


➜  ~ service nginx stop    
Redirecting to /bin/systemctl stop nginx.service


➜  ~ ps -aux | grep "nginx"
root      3896  0.0  0.0 112704   988 pts/0    S+   21:16   0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn nginx

server B:

After running service nginx stop, the Nginx processes are NOT killed at all:

[root@machine123 ~]# ps -aux | grep "nginx"
root        1376  0.0  0.1 136592 12592 ?        Ss   09:21   0:00 nginx: master process nginx -c /etc/nginx/nginx.conf
root        1388  0.0  0.1 165788 13072 ?        S    09:21   0:00 nginx: worker process
root        1389  0.0  0.1 165788 11392 ?        S    09:21   0:00 nginx: worker process
root        1390  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1391  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1392  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1393  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1394  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1395  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1396  0.0  0.1 165552  9068 ?        S    09:21   0:00 nginx: cache manager process
root        1892  0.0  0.0  12108  1084 pts/0    S+   09:48   0:00 grep --color=auto nginx


[root@machine123 ~]# service nginx stop
Redirecting to /bin/systemctl stop nginx.service


[root@machine123 ~]# ps -aux | grep "nginx"
root        1376  0.0  0.1 136592 12592 ?        Ss   09:21   0:00 nginx: master process nginx -c /etc/nginx/nginx.conf
root        1388  0.0  0.1 165788 13072 ?        S    09:21   0:00 nginx: worker process
root        1389  0.0  0.1 165788 11392 ?        S    09:21   0:00 nginx: worker process
root        1390  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1391  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1392  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1393  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1394  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1395  0.0  0.1 165788  9260 ?        S    09:21   0:00 nginx: worker process
root        1396  0.0  0.1 165552  9068 ?        S    09:21   0:00 nginx: cache manager process
root        1906  0.0  0.0  12108  1028 pts/0    S+   09:49   0:00 grep --color=auto nginx

Is there anything I can do to debug this?

Thanks for any tips.

systemctl status nginx Results:

[root@machine123 ~]# systemctl status nginx
● nginx.service - The nginx HTTP and reverse proxy server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2020-09-18 09:34:52 CST; 36min ago
  Process: 1868 ExecStart=/usr/sbin/nginx (code=exited, status=1/FAILURE)
  Process: 1865 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=0/SUCCESS)
  Process: 1862 ExecStartPre=/usr/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)

Sep 18 09:34:51 machine123 nginx[1868]: nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
Sep 18 09:34:51 machine123 nginx[1868]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Sep 18 09:34:51 machine123 nginx[1868]: nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
Sep 18 09:34:51 machine123 nginx[1868]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Sep 18 09:34:52 machine123 nginx[1868]: nginx: [emerg] bind() to 0.0.0.0:443 failed (98: Address already in use)
Sep 18 09:34:52 machine123 nginx[1868]: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
Sep 18 09:34:52 machine123 nginx[1868]: nginx: [emerg] still could not bind()
Sep 18 09:34:52 machine123 systemd[1]: nginx.service: Control process exited, code=exited status=1
Sep 18 09:34:52 machine123 systemd[1]: nginx.service: Failed with result 'exit-code'.
Sep 18 09:34:52 machine123 systemd[1]: Failed to start The nginx HTTP and reverse proxy server.