Weird problem with Form Helper and cache

I use cake some years now from v1.2

I will write down a problem I had just to share it with you and find out whether it's a bug or not.

In my app controller in beforeFilter I have:

if (($newarticles = Cache::read('newarticles', 'short')) == null)

    {

      $this->loadModel('Article');

      $this->Article->recursive = -1;

      $newarticles = $this->Article->find('all', array(...some conditions...);

      Cache::write('newarticles', $newarticles, 'short');

    }

that is to show to a widget in my default layout some new articles. I don't want to query the DB all the time so I cache them. 

In another form (users/edit) I load the user model which hasOne UserDetail. UserDetail has a field newarticles.

When I use  

 echo $this->Form->input('UserDetail.newarticles', array(
      'type'  => 'checkbox',
      'label' => 'new articles?',
      'div'   => array('class' => 'checkbox'))) . "\n";

a select box appears with data from $newarticles in AppController. Isn't that a weird behaviour?

thanks a lot

PS: in AppController I renamed $newarticles to $newarticles1 and everything is fine.

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