Index with multiple loops of current month's content in 3 columns

I’d like to display on the index page the current month’s posts (an unknown number) divided into three columns. The middle column is wider than the other two and shows a medium-sized featured image rather than the thumbnail size. The middle column will also show a different type of excerpt. From different sources this is what I’ve pieced together so far:

<?php
/*
Template Name: Three-column Index
*/
get_header(); ?>

<?php
$current_month = date('m');
$current_year = date('Y');
$issue = array('year'=> $current_year,'monthnum'=> $current_month,'post_status'=>'publish','numberposts'=>-1);
$numposts = count( get_posts( $issue ) );
$columnOneTwoPosts = round($numposts / 3);
if(3*$columnOneTwoPosts < $numposts) {
    $columnThreePosts = $columnOneTwoPosts + 1;
} elseif(3*$columnOneTwoPosts > $numposts) {
    $columnThreePosts = $columnOneTwoPosts - 1;
} elseif(3*$columnOneTwoPosts == $numposts) {
    $columnThreePosts = $columnOneTwoPosts;
}
$columnTwoOffset = $columnOneTwoPosts;
$columnThreeOffset = 2*$columnOneTwoPosts;
?>

<?php if (have_posts()) : ?>

    <h2><?php the_time('F Y'); ?></h2>

    <div class="row">
        <div class="col25">

        <?php query_posts('showposts='.$columnOneTwoPosts.'&offset=0'); ?>
        <?php while (have_posts()) : the_post(); ?>

            <article <?php post_class('module') ?>>

                <div class="entry">
                    <figure>
                        <a href="<?php the_permalink() ?>" class="block-link"></a>
                        <?php if ( has_post_thumbnail()) : ?>
                        <?php the_post_thumbnail('thumbnail', array ('class' => 'featured-image')); ?>
                        <?php endif; ?>
                        <figcaption><?php the_category(', ') ?></figcaption>
                     </figure>
                     <h2 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
                     <?php echo custom_field_excerpt(); ?>
                     <a href="<?php the_permalink() ?>" class="button"><span>Read More</span></a>
                </div>

             </article>

             <?php endwhile; ?>

         </div><!-- .col25 -->
         <div class="col45">

             <?php query_posts('showposts='.$columnOneTwoPosts.'&offset='.$columnTwoOffset); ?>
             <?php while (have_posts()) : the_post(); ?>

             <article <?php post_class('module') ?>>

                <div class="entry">
                    <figure>
                        <a href="<?php the_permalink() ?>" class="block-link"></a>
                        <?php if ( has_post_thumbnail()) : ?>
                        <?php the_post_thumbnail('medium', array ('class' => 'featured-image')); ?>
                        <?php endif; ?>
                        <figcaption><?php the_category(', ') ?></figcaption>
                     </figure>
                     <h2 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
                     <p><?php the_field('short_excerpt'); ?></p>
                     <a href="<?php the_permalink() ?>" class="button"><span>Read More</span></a>
                </div>

             </article>

             <?php endwhile; ?>

         </div><!-- .col45 -->
         <div class="col25">

             <?php query_posts('showposts='.$columnThreePosts.'&offset='.$columnThreeOffset); ?>
             <?php while (have_posts()) : the_post(); ?>

             <article <?php post_class('module') ?>>

                <div class="entry">
                    <figure>
                        <a href="<?php the_permalink() ?>" class="block-link"></a>
                        <?php if ( has_post_thumbnail()) : ?>
                        <?php the_post_thumbnail('thumbnail', array ('class' => 'featured-image')); ?>
                        <?php endif; ?>
                        <figcaption><?php the_category(', ') ?></figcaption>
                    </figure>
                    <h2 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
                    <?php echo custom_field_excerpt(); ?>
                    <a href="<?php the_permalink() ?>" class="button"><span>Read More</span></a>
                </div>

             </article>

             <?php endwhile; ?>

         </div><!-- .col25 -->
    </div><!-- .row -->

    <?php if (show_pagination()) : ?>

        <div class="navigation">

                <?php previous_posts_link('< Prev', '0'); ?>

                <?php
                $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
                echo '&nbsp;Page ' . $paged . ' of ' . $wp_query->max_num_pages . '&nbsp;';
                ?>

                <?php next_posts_link('Next >', '0'); ?>

        </div><!-- .navigation -->

    <?php endif; ?>

<?php else : ?>

    <h2><?php _e('Nothing Found','theme'); ?></h2>

<?php endif; ?>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

It is showing however all posts and not just ones from the current month besides showing repeat posts per column. The navigation is also broken.