Last image not showing

I'm using an image slider to display images and the last image doesn't show (although the slider indicates the correct number of images but the last one is blank.

http://afahomes.com/listing.php?144-Old-Post-Road-1

My code:
<div id="slider3">

<ul>

<?php foreach ($listingsRecord['uploads'] as $upload): ?><?php if ($upload['isImage']): ?>


<li style="background-image:url(<?php echo $upload['urlPath'] ?>)">


</li>
<?php endif ?>
<?php endforeach ?>
</ul>
</div>