I agree.
The problem is that the webpage says:
Line 11:
<link href="index.html" rel="canonical" />
Line 44-46:
<div class='canonical-url'>
/articles/the-biggest-insect-ever-was-a-huge-dragonfly/
</div>
I'm not sure what the second link does, but the first definitively confuses the HN server.
@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.