Hi,
1. We'll see what we can do to avoid that in the future.
2. Try to change the code:
var google_tag_params = {ecomm_prodid: [\''.implode('\',\'', $tags) .'\'], ecomm_pagetype: \'product\' };
var google_conversion_id = '.(int)$this->params->get('adwordsid').';
var google_custom_params = window.google_tag_params;
var google_remarketing_only = true;
to:
/* <![CDATA[ */
var google_tag_params = {ecomm_prodid: [\''.implode('\',\'', $tags) .'\'], ecomm_pagetype: \'product\' };
var google_conversion_id = '.(int)$this->params->get('adwordsid').';
var google_custom_params = window.google_tag_params;
var google_remarketing_only = true;
/* ]]> */
in the file plugins/system/hikashopremarketing/hikashopremarketing.php and see if that helps for the warnings.