Why vew helper duplicates the menu displays, though I give him a different set of data. Twice menu 'navigation1' is displayed
<?php echo $this->navigation('navigation1')->menu() ?>
<?php echo $this->navigation('navigation2')->menu() ?>
But the following code, individually, displays a different menu
<?php //echo $this->navigation('navigation1')->menu() ?>
<?php echo $this->navigation('navigation2')->menu() ?>
and
<?php echo $this->navigation('navigation1')->menu() ?>
<?php //echo $this->navigation('navigation2')->menu() ?>
Why is this happening and how can I avoid this? Thanks.