Entering text in 2 custom fields, only 1 is working

Hello
I’m using 2 custom fields on my blog. One is called Image and the other is URL.
When I enter them both on the write post page, only the one I entered last is working.
Example:
First I enter URL, and I click add custom field.
Then I enter Image and click add custom field.
Then I post my message.
But only the data from Image has been saved.
When I go back by clicking edit post, my Custom field ‘URL’ has disappeared. I enter it again and click save and now are they working both.
But I want it to save it directly from the first time, because this is taking a lot of time.
Here is my code:

<?php get_header(); ?>
  <div id="content">

  <?php if (have_posts()) : while (have_posts()) : the_post(); ?>

      <div class="post-nav">
         <span class="previous"><?php previous_post_link('%link') ?></span>
         <span class="next"><?php next_post_link('%link') ?></span>
      </div>
<?php the_date('','<center><div class="datebar"><div class="datetext">Movie posted on ','</div></div></center>'); ?>
      <div class="post" id="post-<?php the_ID(); ?>">
         <div class="title">
<div id="thumbnail">
      <?php
// this grabs the URL
	$values = get_post_custom_values("URL");
// this checks to see if an image file exists
	if (isset($values[0])) {
?>
      <?php } ?>
<table border="0">
<tr>
<td rowspan="2">
<?php
// this grabs the image filename
	$values = get_post_custom_values("Image");
// this checks to see if an image file exists
	if (isset($values[0])) {
?>
      <a href="<?php $values = get_post_custom_values("URL"); echo $values[0]; ?>" target="_blank" rel="bookmark"><img src="<?php $values = get_post_custom_values("Image"); echo $values[0]; ?>" alt="" /></a>
      <?php } ?>
</td>
<td>
<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2><div class="cattext">(<?php the_category(', ') ?>)</div>
</div>
</td>
</tr>
<tr>
<td>
<div class="entry">
            <?php the_content('Continue reading &raquo;'); ?>

</td>
</tr>
</table>

</div><!--/entry -->
        </div><!--/post -->
</div>

	<?php endwhile; else: ?>

         <p>Sorry, no posts matched your criteria.</p>

	<?php endif; ?>

	</div><!--/content -->

  		<div id="footer">
		  	<span class="mangoorange">
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         </span>
		</div>

</div><!--/left-col -->

<?php
$current_page = $post->ID; // Hack to prevent the no sidebar error
include_once("sidebar-right.php");
?>

<?php get_footer(); ?>

I hope you see a fault in the code and help me out.
Thanks for looking!