HTML encoding Title tag - so apostrophes display as HTML code

Hi,

Not sure if this is an issue with the theme but maybe someone can point me in the right direction:

We use 7.x-1.1 as our base theme for our charity site. The base files haven't been over-ridden very much. This is a bit of our html.php file:

 <?php print $head; ?>
  <title><?php print $head_title; ?></title>
  <?php print $styles; ?>

If the page title has an apostrophe in it, the browser displays it using its HTML encoding #039.

See http://www.warchild.org.uk/impact/stories/lawrence as an example.

It's not a big deal as it only shows up in the browser tab, but I'm wondering if there's an easy fix?

Thanks very much,

Ben