You should be aware that your Linux password and Samba passwords are stored in two different locations. This provides the Samba administer the flexibility of allowing only some of the Linux users to have Samba accounts.
Use the passwd command to change Linux passwords, which are stored in the /etc/shadow file. Samba passwords are stored in the /etc/samba/smbpasswd file and can be changed smbpasswd command.
This difference is important.
