Weird behaviour in ansible

ansible_test.py

from ansible import playbook, callbacks

def run_playbook(path, extra_vars):

    stats = callbacks.AggregateStats()
    playbook_cb = callbacks.PlaybookCallbacks(verbose=1)
    runner_cb = callbacks.PlaybookRunnerCallbacks(stats, verbose=1)

    pb = playbook.PlayBook(
        playbook=path,
        stats=stats,
        callbacks=playbook_cb,
        runner_callbacks=runner_cb,
        extra_vars=extra_vars)
    return pb.run()

def test(path):
    run_playbook(path, {'name': 'name1'})
    run_playbook(path, {'name': 'name2'})

if __name__ == '__main__':
    import sys
    test(sys.argv[1])

ansible_test.yml

---
- hosts: localhost
  gather_facts: false
  vars:
  - fqdn: "{{name}}.example.com"
  tasks:
  - debug: msg="fqdn={{fqdn}}"
  - debug: msg="fqdn={{fqdn}}"
  - shell: echo fqdn={{fqdn}}
  - shell: echo name={{name}}

output

PLAY [localhost] ************************************************************** 

TASK: [debug msg="fqdn=name1.example.com"] ************************************ 
ok: [localhost] => {"msg": "fqdn=name1.example.com"}

TASK: [debug msg="fqdn=name1.example.com"] ************************************ 
ok: [localhost] => {"msg": "fqdn=name1.example.com"}

TASK: [shell echo fqdn=name1.example.com] ************************************* 
changed: [localhost] => {"changed": true, "cmd": "echo fqdn=name1.example.com ", "delta": "0:00:00.001438", "end": "2013-09-11 19:34:08.013751", "rc": 0, "start": "2013-09-11 19:34:08.012313", "stderr": "", "stdout": "fqdn=name1.example.com"}

TASK: [shell echo name=name1] ************************************************* 
changed: [localhost] => {"changed": true, "cmd": "echo name=name1 ", "delta": "0:00:00.001472", "end": "2013-09-11 19:34:08.099415", "rc": 0, "start": "2013-09-11 19:34:08.097943", "stderr": "", "stdout": "name=name1"}

PLAY [localhost] ************************************************************** 

TASK: [debug msg="fqdn=name2.example.com"] ************************************ 
ok: [localhost] => {"msg": "fqdn=name1.example.com"}

TASK: [debug msg="fqdn=name2.example.com"] ************************************ 
ok: [localhost] => {"msg": "fqdn=name2.example.com"}

TASK: [shell echo fqdn=name2.example.com] ************************************* 
changed: [localhost] => {"changed": true, "cmd": "echo fqdn=name2.example.com ", "delta": "0:00:00.001478", "end": "2013-09-11 19:34:08.278582", "rc": 0, "start": "2013-09-11 19:34:08.277104", "stderr": "", "stdout": "fqdn=name2.example.com"}

TASK: [shell echo name=name2] ************************************************* 
changed: [localhost] => {"changed": true, "cmd": "echo name=name2 ", "delta": "0:00:00.001466", "end": "2013-09-11 19:34:08.366428", "rc": 0, "start": "2013-09-11 19:34:08.364962", "stderr": "", "stdout": "name=name2"}