Mysterious text appears in IE

I can’t figure this one out. On my homepage, I’ve set up a part of the layout to call content from a page. Everything works smoothly in IE 7, Firefox, and Safari. But one person has reported a glitch that I can’t duplicate: the last six characters of the last sentence are repeated, just outside the <div>.

Here’s the page: https://tinyurl.com/2uhwc4 (It only seems to happen under the “About” section.)

Here’s a screenshot of the glitch: https://tinyurl.com/2oxq49

The person having troubles is using Internet Explorer 6, 128-bit encryption, Windows SP1.

This is the php code I use to call the content:

<?php query_posts('page_id=90'); ?>
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<?php the_content(); ?>
<?php endwhile; ?>
<?php endif; ?>

My guess is it’s something to do with the 128-bit encryption, but I have no idea how to fix this. Any suggestions?