Editor field not showing inside group

I’m having an issue, that was OK before, with an editor field in a group. When it’s displayed on the page metabox the editor field is shown outside of the grouping, and if you add an additional box via the + button the editor is missing.

piklist('field', array(
    'type' => 'group',
    'field' => 'coloured-boxes',
    'label' => 'Coloured Boxes (not for home page use)',
    'columns' => 12,
    'add_more' => true,
    'fields' => array(
		 array(
			'field'			=>	'heading',
			'label'			=>	'Heading',
			'add_more'		=>	false,
			'type'			=>	'text',
			'value'			=>	'',
    		'columns' => 12,
			'attributes'	=>	array('maxlength'=>'30')
		),
		array(
			'field'			=>	'image',
			'label'			=>	'Image',
			'add_more'		=>	false,
			'type'			=>	'file',
    		'columns' => 12,
			'options'		=> array('min'=>1,'max'=>1)
		),
		array(
			'field'			=>	'colour',
			'label'			=>	'Colour',
			'description'	=>	'',
			'add_more'		=>	false,
			'type'			=>	'select',
    		'columns' => 12,
			'choices' 		=> array( 'lightgreen' => 'Green', 'orange' => 'Orange', 'blue' => 'Blue', 'red' => 'Red' ),
		),
		array(
			'field'			=>	'content',
			'label'			=>	'Content',
			'add_more'		=>	false,
			'type'			=>	'editor',
    		'columns' => 12,
    		'options' => array('media_buttons' => false, 'textarea_rows' => 10, 'teeny' => true),
		),

	)
));

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