Page-Navi

I keep receiving a 404 on the last page of my website for every odd number of post I have. If I have an even number of post the last page will appear.

website: kobayo.com

below is an extract from my themes index.php

<?php /* Set num of cols */ ?>
            <?php $col = 0; $numcols = 3; ?>

            <?php
				/* Limit num of post displayed & set paged */
				$feat_query = new WP_Query( array('posts_per_page' => 9, 'paged' => get_query_var('paged') ) );
			 ?>

            <?php
				/* Create array to store post ID, prevent duplicate post being displayed */
				//$ids = array();
			?>

            <?php /* Start the latest post loop */ ?>
            <?php while ( $feat_query->have_posts() ) : $feat_query->the_post(); ?>

				<?php if ($ct && $ct%$numcols==0) echo '<div class="clearcol"></div>'; ?>
                <div class="col">
                    <?php get_template_part( 'content', get_post_format() ); ?>
                </div><!-- .col -->
                <?php $ct++; ?>
                <?php $ids[]= $post->ID; ?>
            <?php endwhile; ?>

            <!-- Add page navigation via pagenavi plugin -->
            <?php if(function_exists('wp_pagenavi')) { wp_pagenavi( array( 'query' => $feat_query ) ); } ?>

            <?php wp_reset_postdata(); ?>

            <div class="clearcol"></div>

Thanks for you time.