PASSWORD CHANGES AFTER UPGRADE

Hi All,

I upgrade from 3.1 to 4.1 sp7, after the upgrade the password change.

The Admin password on the older env. 3.1 overwrite the Admin password in the new env 4.1. So now we login with the 3.1 password

I can change the  reset Admin password in 4.1, that's not what l wanted

My question is WHY did the security in 3.1 overwritten the password in  4.1 env. and now we use the 3.1 Admin pw.

Please help

Thanks

Sai