when i edit your list.php like this, it works ??
<?php
/*
* included by adverts/includes/shortcodes.php shortcodes_adverts_list()
*
* @var $loop WP_Query
* @var $query string
* @var $location string
* @var $paged int
*/
?>
<div class="adverts-options">
<form action="" method="get">
<div class="adverts-search">
<div class="advert-input">
<input type="text" name="query" placeholder="<?php _e("Keyword ...", "adverts") ?>" value="<?php esc_attr_e($query) ?>" />
</div>
<div class="advert-input">
<input type="text" name="location" placeholder="<?php _e("Location ...", "adverts") ?>" value="<?php esc_attr_e($location) ?>" />
</div>
</div>
<!--<div class="adverts-options-left adverts-js">
<a href="#" class="adverts-button-small"><span class="adverts-square-icon adverts-icon-th-large"></span></a>
<a href="#" class="adverts-button-small"><span class="adverts-square-icon adverts-icon-th-list"></span></a>
<a href="#" class="adverts-button-small adverts-filter-date"><?php _e("Date") ?> <span class="adverts-icon-sort"></span></a>
</div>-->
<div class="adverts-options-right adverts-js">
<!--<a href="#" class="adverts-button-small"><span class="adverts-icon-filter"><span> <?php _e("Filters ...", "adverts") ?></a>-->
<a href="#" class="adverts-form-submit adverts-button-small"><span class="adverts-icon-search"><span> <?php _e("SEARCH", "adverts") ?></a>
</div>
<div class="adverts-options-fallback adverts-no-js">
<input type="submit" value="<?php _e("Filter Results", "adverts") ?>" />
</div>
</form>
</div>
<div class="adverts-list">
<?php if( $loop->have_posts() ): ?>
<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
<?php include ADVERTS_PATH . 'templates/list-item.php' ?>
<?php endwhile; ?>
<?php else: ?>
<div class="adverts-list-empty"><em><?php _e("There are no ads matching your search criteria.", "adverts") ?></em></div>
<?php endif; ?>
<?php wp_reset_query(); ?>
</div>
<div class="adverts-pagination">
<?php echo paginate_links( array(
'base' => $paginate_base,
'format' => $paginate_format,
'current' => max( 1, $paged ),
'total' => $loop->max_num_pages,
'prev_next' => false
) ); ?>
</div>