Wordpress pagination give duplicate content - wordpress

Question

So i change my wordpress permalink with custom structure "/%category%/%postname%/".
However, if i type manually "/poem/page/2", then it works. But the content of every page is the same. Wether it was "/page/3" or "/page/4", it was all the same.
at first, when i access "/page/2/", my page was giving "404 error". But i got this code from the internet, and when i use the code, it started to work. But, the content of every page is the same. The code goes on like this :
on function.php:
function vipx_filter_category_rewrite_rules( $rules ) {
$categories = get_categories( array( 'hide_empty' => false ) );
if ( is_array( $categories ) && ! empty( $categories ) ) {
$slugs = array();
foreach ( $categories as $category ) {
if ( is_object( $category ) && ! is_wp_error( $category ) ) {
if ( 0 == $category->category_parent ) {
$slugs[] = $category->slug;
} else {
$slugs[] = trim( get_category_parents( $category->term_id, false, '/', true ), '/' );
}
}
}
if ( ! empty( $slugs ) ) {
$rules = array();
foreach ( $slugs as $slug ) {
$rules[ '(' . $slug . ')/feed/(feed|rdf|rss|rss2|atom)?/?$' ] = 'index.php?category_name=$matches[1]&feed=$matches[2]';
$rules[ '(' . $slug . ')/(feed|rdf|rss|rss2|atom)/?$' ] = 'index.php?category_name=$matches[1]&feed=$matches[2]';
$rules[ '(' . $slug . ')(/page/(\d)+/?)?$' ] = 'index.php?category_name=$matches[1]&paged=$matches[3]';
}
}
}
return $rules;
}```
this is my loop post :
?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
echo $paged;
$term = get_queried_object();
$data = array( 'posts_per_page' => 2, 'category_name' => $term->slug, 'page'=>$paged );
$get_category_post = new WP_Query( $data );
?>
<?php if ( $get_category_post->have_posts() ) : while ( $get_category_post->have_posts() ) : $get_category_post->the_post(); ?>
<div class="post__list">
<?php if($term->slug === 'analect' || $term->slug === 'collection') { ?>
<span>for other categories</span>
<?php } else {?>
<span> <?php the_content(); ?> </span>
<?php } ?>
</div>
<?php endwhile; ?>
<?php
next_posts_link();
previous_posts_link();
?>
<?php endif; ?>