title: duplication of products in prestashop backend and front
body: <p>I have imported 16 000 products, and now I have 57 000 products.
  Can any one help me please to delete all duplicated products as you see in picture.
  Product with different id and same reference.</p>
  <p>Image backoffice:</p>
  <p><a href="https://i.stack.imgur.com/Ig8wK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ig8wK.png" alt="" /></a></p>
  <p>Image front:</p>
  <p><a href="https://i.stack.imgur.com/wqTFr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wqTFr.png" alt="" /></a></p>