Why does not appear on these articles everywhere?

I have this page:

link

Each article must appear time was made.On the first page its ok.From page 2 onwards dont display the article data.

CODE PHP:

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

    <?php if( $wp_query->current_post == 0 ){ ?>
        <li class="block first-post">
            <a href="<?php the_permalink(); ?>" class="fancybox-iframe"><?php the_post_thumbnail('vantage-grid-loop'); ?></a>
            <h3><a href="<?php the_permalink(); ?>" class="fancybox-iframe"><?php the_title(); ?></a></h3><br>
            <p class="italic"><?php the_date(); ?></p>
            <p><?php echo substr(get_the_content(),0,600).'...'; ?></p>
        </li>
    <?php } else if( $wp_query->current_post > 0 && $wp_query->current_post < 5 ) { ?>
        <li class="block">
            <a href="<?php the_permalink(); ?>" class="fancybox-iframe"><?php the_post_thumbnail('blog'); ?></a>
            <h3><a href="<?php the_permalink(); ?>" class="fancybox-iframe"><?php echo substr(get_the_title(),0,20).'...'; ?></a></h3><br>
            <p class="italic"> <?php the_date(); ?></p>
            <p><?php echo substr(get_the_content(),0,70).'...'; ?></p>
        </li>
    <?php } else { ?>
        <li class="block">
            <a href="<?php the_permalink(); ?>" class="fancybox-iframe"><?php the_post_thumbnail('blog'); ?></a>
            <h3><a href="<?php the_permalink(); ?>" class="fancybox-iframe"><?php the_title(); ?></a></h3><br>

            //is displayed here date 
            <p class="italic"><?php the_date(); ?></p>
            <p><?php echo substr(get_the_content(),0,600).'...'; ?></p>
        </li>
    <?php } ?>

    <?php //get_template_part( 'content', get_post_format() ); ?>

<?php endwhile; ?>

CODE CSS:

.italic{font-style:italic;cursor:pointer;}

I put a picture to see how the code is on the front page and it is on the second page.
http://i60.tinypic.com/2dcd6rt.jpg

You can help me solve this problem?

Thanks in advance!