Category pagination problem

Hi!
Its my first topic here, i’m from Argentina, and my english is poor, please understand me.
I’ve a wordpress site, where i’ven’t a category.php template.

In my index.php i’ve these:

<?php get_header(); ?>
<?php if( in_category( array('peliculas','accion','animacion','aventuras','belico','ciencia-ficcion','comedia','drama','fantastico','romance','terror','thriller') ) ){
	get_template_part('loop', 'peliculas');
}?>
<?php if ( in_category(array('musica','ambiente','bachata','blues','country','cuarteto','cumbia','dance','dubstep','electronica','heavy-metal','hip-hop','house','jazz','pop','reggae','reggaeton','rock-nacional','rock-internacional','salsa','soul','tecno') ) ){
	get_template_part('loop', 'musica');
}?>
<?php if ( in_category(array('software') ) ) {
	get_template_part('loop', 'software');
}?>
<div class="clearfix"></div>
<?php get_footer(); ?>

All loops are same:

<?php $currentCategory = single_cat_title("", false);
	$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
	$query = array(
	 'category_name' => $currentCategory,
  	 'paged'=> $paged,
 	 'posts_per_page' => '18',
 	 'order' => 'DESC'
	);
$page = new WP_Query( $query );
?>
 <?php if ( $page->have_posts() ) : while ( $page->have_posts() ) : $page->the_post(); ?>

//loop items
<?php endwhile; endif; wp_reset_query(); ?>

<div class="clear"></div>
<?php pagination_links(); ?>

The problem? The page is always displayed!
Can any help me?

More info if you can see the problem:
Category: Peliculas.
Post per page: 18
Link: https://www.megadw.com/categoria/peliculas/accion/

Thanks so much to read!