Pagination Displaying Same Content

try and remove the 'offset' parameter, and try to use a different way to exclude the first post.

also, posts_nav_link() only works on the default query;
try to work with https://codex.www.ads-software.com/Function_Reference/next_posts_link (particular review https://codex.www.ads-software.com/Function_Reference/next_posts_link#Usage_when_querying_the_loop_with_WP_Query ) and https://codex.www.ads-software.com/Function_Reference/previous_posts_link (apply the same coding as for ‘next_posts_link()’)

Thanks for the steer, really helped and managed to find a working solution

<?php
            $display_count = 5;
            $page = (get_query_var('paged')) ? get_query_var('paged') : 1;
            $offset = ($display_count * ($page - 1)) + 1;

            $args=array(
            'caller_get_posts'=>1,
            'orderby' => 'title',
            'order'   => 'DESC',
            'posts_per_page' => $display_count,
            'page'       =>  $page,
	        'offset'     =>  $offset
        );
            $my_query = new WP_Query($args);
            if( $my_query->have_posts() )  {
            while ($my_query->have_posts()) : $my_query->the_post(); ?>
                <article class="row sub-article">
                    <a href="<?php the_permalink();?>" title="<?php the_title();?>">
                        <div class="col-xs-4">
                            <?php the_post_thumbnail('secondary-thumb', array('class' => 'img-responsive')); ?>
                        </div>
                        <div class="col-xs-8">
                            <h4><?php the_title();?></h4>
                        </div>
                    </a>
                </article>

            <?php endwhile;} ?>
            <?php next_posts_link(); ?>
            <?php previous_posts_link(); ?>
            <?php wp_reset_postdata(); ?>