Tutorial Question: Writing a Simple Publisher and Subscriber (C++)

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i'm new to ROS and following the standard tutorial given on the ROS.ORG site. While running based on the topic of writing a simple publisher and subscriber, the outputs for talker and listener are shown below:

Talker output:

[INFO] hello world 1
[INFO] hello world 2
[INFO] hello world 3
[INFO] hello world 4
[INFO] hello world 5
[INFO] hello world 6
[INFO] hello world 7
[INFO] hello world 8

Listener output

[INFO] hello world 3
[INFO] hello world 4
[INFO] hello world 5
[INFO] hello world 6
[INFO] hello world 7
[INFO] hello world 8

It seems that "hello world 0", "hello world 1" and "hello world 2" are missing from the listener.

I have used the original source code given on the topic.

Is this normal, how come they are missing?