rancid takes linux user default

[Sun]

I telnet from a linux machine with user linuxuser (linux username) 

rancid takes that linux user as login user to router(host1) not what is given in file.. how ?, only this router behave like this other are using user name from file only. 

/usr/local/rancid/bin/clogin host1

host1

spawn telnet host1

Trying host1

Connected to host1

Escape character is '^]'.

User Access Verification

Username: linuxuser

Password:

though I put different user in configuration file 

why so any idea guys ?