User Id Updating

I am debugging a save
debug($this->User->save($this->data[$model_table], true,
array_keys($this->User->$join_table->schema())));

Everything is working fine in regards to the save except in the debug array
I see User id...and in the SQL log I see

UPDATE `users` SET `id` = 3 WHERE `users`.`id` = 3

Array
(
[User] => Array
(
[id] => 3
)

[System] => Array
(
[0] => 3
[1] => 5
[2] => 4
[3] => 6
[4] => 1
[5] => 2
[6] => 3
[7] => 5
[8] => 4
[9] => 6
[10] => 1
[11] => 2
)

)
I have nothing in the controller relating to the User.id except
$this->User->id = $this->Auth->user('id');
$this->set('user', $this->User->read('id', $this->Auth->user('id')));

Why is updatng? Any ideas?

thanks

Dave

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