Posts disappear – need republishing to show

Hello, thanks for this wonderful application. I’m relatively new to WP, but I’ve managed to create a site that works OK for my use.

I’m using different .php-pages for showing different categories, using a
<?php if ( in_category(‘numberofcategory’) ) { ?>
in the loop on each page. See below.

Now I’m struggling with that suddenly posts will be disappearing from these pages, forcing me to edit the posts and re-publish them. What can be causing this?
Also, I noticed that posting posts with other users than admin can cause earlier posts to disappear as well..
Any ideas?
Thanks!


<!-- Start the Loop. -->
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

<!-- The following tests if the current post is in category 9. -->
<?php if ( in_category('2') ) { ?>
<h3><?php the_title(); ?></h3>

<!-- Display the Post's Content in a div box. -->
<div class="entry">
<?php the_content(); ?>
</div>

<?php } else { ?>
<div class="post">
<?php } ?>

<!-- Stop The Loop (but note the "else:" - see next line). -->
<?php endwhile; else: ?>

<!-- The very first "if" tested to see if there were any Posts to -->
<!-- display. This "else" part tells what do if there weren't any. -->
Sorry, no posts matched your criteria.

<!-- REALLY stop The Loop. -->
<?php endif; ?>

My page: http://www.stasunniva.com
Best regards,
Eyvind Ljungquist