Blog converting to smart quotes and breaking textile/markitup links

The blog detail page seems to be converting quotes used for a link into smart quotes and therefore breaking the link, so instead out outputting:

The minutes for the April 2014 Parish Council Meeting are now available from the Parish Council meetings page.

I get

The minutes for the April 2014 Parish Council Meeting are now available from the \“Parish Council meetings\”:https://www.annesleyfelley-pc.org.uk/parish-council/meetings.php page.

The excerpt work okay in the list of posts, here is the template.

<article class="hentry">
  <perch:blog id="postTitle" type="text" label="Title" required="true" size="xl autowidth" order="1" suppress="true" />
  <h2 class="published">Published <perch:blog id="postDateTime" type="date" label="Date" time="true" format="%d %B %Y" divider-before="Meta information" /></h2>
  <img src="<perch:blog id="image" type="image" width="320" height="320" crop="true" label="Image" order="4" />" alt="<perch:blog id="postTitle" />" />
  <div class="description entry-content">
    <perch:blog id="postDescHTML" type="textarea" label="Post" order="2" editor="markitup" textile="true" size="xxl autowidth" required="true" />
  </div>
</article>

<perch:blog id="excerpt" type="textarea" label="Excerpt" textile="true" order="3" suppress="true" size="s" editor="markitup" />
<perch:blog id="image" type="image" width="500" height="500" suppress="true" />

Any ideas why the Post isn’t working but the excerpt is?