$this->ModelName->invalidFields(); return duplicates

Hello there,

Why does $this->ModelName->invalidFields(); returns the following
array?
array('field1' => array('error1', 'error1'), 'field2' => 'error2',
'error2');

Is it designed to do this or I am making a mistake somewhere?
I am using cake 2.0.x

Any help on this is greatly appreciated.
Thank you.

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