Sounds like somebody has set up autologin with something like tweak UI. If you have tweakUI installed, you can turn this off. If not and you have access to the registry and you can do this.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
To disable, change the AutoAdminLogon value to "0" to turn it off, or you can change the DefaultPassword to the correct password.
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