I agree.

The problem is that the webpage says:

Line 11:

  <link href="index.html" rel="canonical" />

  <div class='canonical-url'>
  /articles/the-biggest-insect-ever-was-a-huge-dragonfly/
  </div>

@OP: Is this your webpage? Do you know the owners? Can you fix it? If not, send an email to dang/tomhow so they can advice what to do.