title: Google tag manager adding async scripts in to head of page
body: <p>I've recently moved some of our scripts into Google tag manager via Custom HTML with a document with write enabled. However, most, if not all scripts are being added to the head of the page as a async script.</p>
  
  <p>For example:</p>
  
  <pre><code>&lt;head&gt;
  &lt;script async type="text/javascript" src="https://www.externalSite.co.uk/visitor.js?mhRand=1513770036670"&gt;&lt;/script&gt;
  &lt;/head&gt;
  </code></pre>
  
  <p>Why are these being added to the head of the site, instead they should be loaded at the bottom of the page? </p>
  
  <p>Am I missing a setting somewhere within GTM?</p>