Why is my rating having a duplicate values?

below is my view.phtml look like. I’m using Magento “ver. 1.6.0.0“
<?php if( $this->getRating() && $this->getRating()->getSize()): ?>
<h3><?php echo $this->__('Product Rating:') ?></h3>
<table class="ratings-table">
<?php foreach ($this->getRating() as $_rating): ?>
<?php if($_rating->getPercent()): ?>
<tr>
<th><?php echo $this->__($this->escapeHtml($_rating->getRatingCode())) ?></th>
<td>
<div class="rating-box">
<div class="rating" style="width:<?php echo ceil($_rating->getPercent()) ?>%;"></div>
</div>
</td>
</tr>
<?php endif; ?>
<?php endforeach; ?>
</table>
</dl>
<?php endif; ?>
did you check your configuration in backend? Under Catalog -> Reviews and Ratings -> Manage Rating. Maybe they are double configured. Otherwise it seems to be a data problem.
cheers