Why does $users return 2 root users?

Question

linux

How can it happen that there are allegedly 2 active root users in the system? I was surprised, I changed the port again, passwords, but nevertheless, what options can be considered?

Answer 1

info coreutils 'users invocation'

`users' prints on a single line a blank-separated list of user names of
users currently logged in to the current host. Each user name
corresponds to a login session, so if a user has more than one login
session, that user's name will appear the same number of times in the
output.

Answer 2

Here are some more interesting commands for you to "play around"
w
who
last