add_meta_box with 'side' context messes up admin area

Hi
I’m going nuts trying to add a meta box to a custom post type. If I add the context as ‘side’, all the boxes (title, text editor etc.) all move to the side too!

He’s the code I’ve got…

function boxed_add_metaboxes($page,$post) {
if(in_array($page,array('custom-post-type')))
  add_meta_box('in-featured-item','Featured Item','cpt_display_fields',$page,'side','low');
}
add_action('add_meta_boxes','boxed_add_metaboxes',10,2);

Any of you fine people have any ideas?