&gt; Are you implying the .co.uk version did not have the same &quot;design elements&quot;?<p>Classifiers do weird things, and features you don&#x27;t expect to be significant can suddenly have a much larger than intended effect. The domain name, as a feature, must&#x27;ve thrown it over the edge.<p>It&#x27;s like that Google+ post where a picture of a couple of black people got tagged as &quot;gorillas&quot; by their auto-tagging ML system. No, Google isn&#x27;t racist, their classifier just hates their PR department.<p>Ah, the joys of machine learning...