Java - Syncronized Thread - Output in wrong order

I'm reading Java The Complete Reference(9th Edition) after year of fooling around with Java. Been happy with the book so far but I now have a really strange problem with synchronized threads:

package syncro;

class Callme {
    void call(String msg) {
        System.out.print("[" + msg);
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            System.out.println("Interrupted");
        }
        System.out.println("]");
    }
}

class Caller1 implements Runnable {
    String msg;
    Callme target;
    Thread t;

    public Caller1(Callme targ, String s) {
        target = targ;
        msg = s;
        t = new Thread(this);
        t.start();
    }

    @Override
    public void run() {
        synchronized (target) { // SYNC BLOCK
            target.call(msg);
        }

    }
}

public class Syncronized {
    public static void main(String[] args) {
        Callme target = new Callme();
        Caller1 ob1 = new Caller1(target, "Hello");
        Caller1 ob2 = new Caller1(target, "Synchronized");
        Caller1 ob3 = new Caller1(target, "World");

        try {
            ob1.t.join();
            ob2.t.join();
            ob3.t.join();
        } catch (InterruptedException e) {
            System.out.println("Interrupted");
        }
    }

}

It prints out:

[Hello]
[World]
[Synchronized]

and I don't understand how that's even possible. Also worth mentioning, if I swap the lines

 Caller1 ob2 = new Caller1(target, "Synchronized");
 Caller1 ob3 = new Caller1(target, "World");

(constructor is called with the string "World" before "Synchronized") it will print

[Hello]
[Synchronized]
[World]

as I would have expected in the first place.

I didn't find a question like this here so I hope I'm doing this right... Thanks!