Infinite scroll repeats initial posts

Thanks, I really appreciate the quick response. Unfortunately neither of these seem to be causing the issue. Just in case I changed the ID, and article-snippet doesn’t really contain anything that would effect the query. Just in case here is the code (some custom functions but none that I would think would cause issues here:

$fields = nymj_get_fields([
	'pdf',
	'localize--summary'
]);
$cat = get_the_terms( get_the_id(), 'category' );
$cat_name = sprintf( __( '%s', 'nymj' ), $cat[0]->name );
$title = get_the_title();
$authors = nymj_get_authors();

$issue = get_the_terms( $current_id, 'issue' );
$issue_date = get_field( 'meta_issue_published_date', 'issue_' . $issue[0]->term_id );
$issue_date = sprintf( __( '%s', 'nymj' ), $issue_date );

$url = get_post_permalink();
$summary = $fields['summary'];
if( !$summary ) {
	$summary = nymj_make_summary( 150 );
}
?>

<!-- SINGLE SNIPPET -->
<article class="article-snippet" itemscope itemtype="http://schema.org/MedicalScholarlyArticle">

	<!-- Tag -->
	<div class="article-snippet__tag" itemprop="articleSection"><?php echo $cat_name; ?></div>

	<div class="article-snippet__content-wrap">

		<!-- Title -->
		<h3 class="article-snippet__title" itemprop="headline">
			<span class="main"><?php echo $title; ?></span>
		</h3>

		<!-- Summary -->
		<p class="article-snippet__summary" itemprop="description">
			<?php echo $summary; ?>
		</p>

		<!-- Meta -->
		<div class="article-snippet__meta">

			<div class="authors">
				<i><?php _e( 'by', 'nymj' ); ?></i>
				<ul>
					<li itemprop="author"><?php echo $authors[0]; ?></li>
				</ul>
			</div>

			<div class="published" itemprop="datePublished">
				<?php echo $issue_date; ?>
			</div>

			<div class="links">
				<ul class="inline-list">
					<li><?php if( function_exists( 'sharing_display' ) ) { sharing_display( '', true ); } ?></span></li>
					<?php if( $fields['pdf'] ) { ?>
						<li><a href="<?php echo $fields['pdf']['url']; ?>" title="<?php _e( 'Download the PDF', 'nymj' ); ?>" target="_blank"><i class="icon-pdf"></i><?php _e( 'PDF', 'nymj' ); ?></a></li>
					<?php } ?>
					<li><a href="<?php echo $url; ?>" itemprop="url"><?php _e( 'Read Full Text', 'nymj' ); ?></a></li>
				</ul>
			</div>

		</div>

	</div>

</article>

Also, I just removed the query filter and tried the default archive for my articles post type. It gave the same result. Without any modifications to the main query, the archive is showing the initial 3 posts then infinite scroll reloads them as it initializes, so the issue must be somewhere else.