SSHing to a CentOS server switches to a different user

I've started managing a CentOS 7 server for a new client that is managed via Plesk. I'm not familiar with either Centos or Plesk. If I SSH to the server like:

workspaceuser@1.2.3.4

, immediately upon connecting I see that I'm a different user. Ie

shows a completely different user. Are there any places I can look either via Plesk or on the server to figure how/why it's changing user? Thanks! EDIT: Contents of /etc/passwd :

differentuser:x:10000:1003::/var/www/vhosts/example.com:/bin/false
workspaceuser:x:10000:1003::/var/www/vhosts/example.com:/bin/bash
acme-john:x:10000:1003::/var/www/vhosts/example.com/httpdocs:/bin/false
acme_admin:x:10000:1003::/var/www/vhosts/example.com/home.example.com:/bin/false