wordpress attachment not grabbing the correct images - php

Question

I'm trying to get the list of the images attach in a post to build a slider, but it's happen that the images that has being grab are the first two images in the media library and not the images add it to the post
content-gallery.php
<article id="post-<?php the_ID(); ?>" <?php post_class( 'advanceplr-format-gallery' ); ?>>
<header class="entry-header text-center">
<?php if( advanceplr_get_attachment() ):
$attachments = advanceplr_get_attachment(7);
var_dump($attachments);
?>
<div id="post-gallery-<?php the_ID(); ?>" class="carousel slide" data-ride="carousel">
<div class="carousel-inner" role="listbox">
<?php
$i = 0;
foreach( $attachments as $attachment ):
$active = ( $i == 0 ? ' active' : '' );
?>
<div class="item<?php echo $active; ?> background-image standard-featured" style="background-image: url( <?php echo wp_get_attachment_url( $attachment->ID ); ?> );"></div>
<?php $i++; endforeach; ?>
</div><!-- .carousel-inner -->
<a class="left carousel-control" href="#post-gallery-<?php the_ID(); ?>" role="button" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="right carousel-control" href="#post-gallery-<?php the_ID(); ?>" role="button" data-slide="next">
<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div><!-- .carousel -->
<?php endif; ?>
<?php the_title( '<h1 class="entry-title">', '</h1>'); ?>
<div class="entry-meta">
<?php echo advanceplr_posted_meta(); ?>
</div>
</header>
<div class="entry-content">
<div class="entry-excerpt">
<?php the_excerpt(); ?>
</div>
<div class="button-container text-center">
<?php _e( 'Read More' ); ?>
</div>
</div><!-- .entry-content -->
<footer class="entry-footer">
<?php echo advanceplr_posted_footer(); ?>
</footer>
theme-support.php
function advanceplr_get_attachment( $num = 1 ){
$output = '';
if( has_post_thumbnail() && $num == 1 ):
$output = wp_get_attachment_url( get_post_thumbnail_id( get_the_ID() ) );
else:
$attachments = get_posts( array(
'post_type' => 'attachment',
'posts_per_page' => $num,
'post_parent' => get_the_ID()
) );
if( $attachments && $num == 1 ):
foreach ( $attachments as $attachment ):
$output = wp_get_attachment_url( $attachment->ID );
endforeach;
elseif( $attachments && $num > 1 ):
$output = $attachments;
endif;
wp_reset_postdata();
endif;
return $output; }
I also have a post format for the image that use the same code and it working,
content-image.php
<article id="post-<?php the_ID(); ?>" <?php post_class( 'advanceplr-format-image' ); ?> >
<header class="entry-header text-center background-image" style="background-image: url(<?php echo advanceplr_get_attachment(); ?>);">
<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
<div class="entry-meta">
<?php echo advanceplr_posted_meta(); ?>
</div>
<div class="entry-excerpt image-caption">
<?php the_excerpt(); ?>
</div>
</header>
<footer class="entry-footer">
<?php echo advanceplr_posted_footer(); ?>
</footer>