Password randomiser: creates the same password

The point is to make a password randomiser, but my problem is that my code makes the same password all the time. I have tried all kind of stuff and this is the latest one where I have gotten by using the Internet.

Main class:

class Program {
    public static void main(String[] args) {
        PasswordRandomizer randomizer = new PasswordRandomizer(13);
        System.out.println("Password: " + randomizer.createPassword());
        System.out.println("Password: " + randomizer.createPassword());
        System.out.println("Password: " + randomizer.createPassword());
        System.out.println("Password: " + randomizer.createPassword());
    }
}

The Program class:

import java.util.Random;
public class PasswordRandomizer {
    // Define the variables

    private Random password = new Random();
    private int length;
    private String character; 

    public PasswordRandomizer(int length) {
        //creates a new object, uses the given password length
        this.length = length;

        String characters = "";

            Random rndNumbers = new Random();
            int randomnumber = 0;


            for (int nbr = 1; nbr < length; nbr++) {
                randomnumber = rndNumbers.nextInt(25);

                char character = "abcdefghijklmnopqrstuvwxyz".charAt(randomnumber);
                characters = characters + character; 
            }

        System.out.println(characters);
        this.character = characters;
    }


    public String createPassword() {
        // write code that returns a randomized password
        PasswordRandomizer randomizer = new PasswordRandomizer(13);
        //consists of symbols a-z and is of the length given as a parameter to the constructor
        return this.character;  
    }
}

In the PasswordRandomizer method, there is the line System.out.println(characters); which prints out the randomized password every time. BUT the different password doesn't come in the createPassword method, only the first one which results in the same password all the time in the output.