[arch-general] user management error

[message]

Readers,

A previously existing /home directory was mounted into the file system 
during the installation process; this directory contained files in a 
directory 'a'.

A user was created from the root user account:

useradd -M -p [password] -s /bin/bash [username'a']

After reboot, the system is restarted as root because the user 'a' is 
stated to not exist. The command 'cat /etc/passwd' reveals a password 
'x', but this is not the password that was entered.

How to solve this error?