Visual Composer Unable to Populate textarea_html when image is inserted in edit

vc_map( array(
  'name' => __( 'myname Article Content', 'myname' ),
  'base' => 'myname-article-content', //my shortcode name
  'class' => '',
  'icon' => 'icon-wpb-vc_carousel',
  'category' => __( 'Content', 'myname' ),
  'description' => __( 'Content for Article', 'myname' ),
  'params' => array(
    array(
      'type' => 'textfield',
      'heading' => __( 'Image Caption', 'myname' ),
      'param_name' => 'caption',
      'description' => __( 'Enter text which will be used as Image    Caption.', 'myname' )
      ),
    array(
      'type' => 'textfield',
      'heading' => __( 'Image credits', 'myname' ),
      'param_name' => 'credits',
      'description' => __( 'Enter text which will be used as Image credits. Leave blank if no title is needed.', 'myname' )
      ),
    array(
      'type'        => 'textarea_html',
      'holder'      => 'div',
      'heading'     => __( 'Content', 'myname' ),
      'param_name'  => 'body_text',
      'description' => __( 'Enter the Body of the news', 'myname' )
      )
    )
  ) );

in this codes.. the only thing that is not working properly is the textarea_html in my visual composer.

if the content has no image added the vc_map is operational in the editor and in the frontend.

But when I add an image, after saving the content in the editor, the contents in the textarea_html will be shown in the holder and that’s where it should be, BUT when i click edit again it can’t populate the content of the textarea_html but the other contents like textfields are shown.

any ideas? Thanks..