Post “pager” nav for sibling posts failing

I created a “pager” of sorts which is essentially a simple way to navigate between posts of the same taxonomy term. This seems to work fine except for a few examples where it’s pulling in posts from other categories. I’ve triple checked and even re-saved these posts to ensure they only belong to a single term. I’ve tried stripping away all other code but I can’t seem to figure out what’s wrong. Is it something with my work below? I’m at a loss as to what’s going on. Is there a better way to do this all together? Any ideas are much appreciated!

<div class="work-pager cycle-pager">
<?php foreach((get_the_terms($post->ID, 'work_category')) as $currentterm) {}
$args = array (
    'post_type' => 'work',
    'tax_query' => array(
        array(
            'taxonomy' => 'work_category',
            'field'    => 'term_id',
            'terms'    => $currentterm,
        ),
    ),
);
$work_nav_query = new WP_Query( $args );
$current_post_ID = $post->ID;
if ( $work_nav_query->have_posts() ) {
    while ( $work_nav_query->have_posts() ) {
        $work_nav_query->the_post();
        $class = get_the_ID($work_nav_query) == $current_post_ID ? 'cycle-pager-active' : '' ; ?>
        <span class="<?php echo $class . $currentterm->ID; ?>"><a href="<?php echo get_the_permalink(); ?>" title="<?php echo get_the_title(); ?>">?</a></span>
    <?php }
}
wp_reset_postdata(); ?>