Pages not working in blog categories

I’m having a weird issue where paging works fine for some of my categories but not for my blog categories.

For example:

https://www.tradereadingorder.com/list/dc-comics-universe/recommended-reading-order/

and

https://www.tradereadingorder.com/list/dc-comics-universe/recommended-reading-order/page/2/

work fine,

but

https://www.tradereadingorder.com/blog/ does and

https://www.tradereadingorder.com/blog/page/2/ does NOT.

I feel like it must SOMEHOW have something to do with my category-blog.php but I can’t figure out what.

<?php
get_header();
?>
<div id="content">

<?php /* If this is a category archive */ if (is_category()) { ?>

<div id="booklist-header">
<table width="100%" height="159px">
<tr>
<td rowspan="2" width="195px" align="left">
<img src="https://www.tradereadingorder.com/list-image/blog.jpg">
</td>
<td align="left">
        <div id="booklist-title"><?php single_cat_title();?>
</div>
</td>
</tr>
<tr>
<td align="left">
<?php echo category_description( $category ); ?>
</td>
</table>
</div>

<?php } ?>

<div id="blog-loop">

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div id="single-post-header">
<div id="booklist-title"><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title();?>"><?php the_title(); ?></a></div>
<div class="blog-post-title"><!-- <?php _e("filed in"); the_category(',') ?>--> By <?php the_author_posts_link(); ?> | <?php the_date('l, F j, Y',' ',' '); unset($previousday); ?> | <?php the_time() ?> | <?php comments_popup_link(__('0 Comments'), __('1 Comment'), __('% Comments')); ?> <?php edit_post_link(__('[Edit]')); ?></div>
</div>
<div class="blog-post" id="post-<?php the_ID(); ?>">

	<div class="storycontent">
		<?php the_content(__('(more...)')); ?>
<div class="feedback">
            <?php comments_popup_link(__('Comment<b>!</b>'), __('1 Comment'), __('% Comments')); ?>
<br />
<!-- AddThis Button BEGIN -->
<?php echo "<div><a class=\"addthis_button\" href=\"https://www.addthis.com/bookmark.php?v=250&username=f4shi0nabl3\" addthis:url=\"".urlencode(get_permalink())."\" addthis:title=\"".urlencode(get_the_title($id))."\"><img src=\"https://s7.addthis.com/static/btn/v2/lg-share-en.gif\" width=\"125\" height=\"16\" alt=\"Bookmark and Share\" style=\"border:0\"/></a><script type=\"text/javascript\" src=\"https://s7.addthis.com/js/250/addthis_widget.js#username=f4shi0nabl3\"></script></div>"; ?>
<!-- AddThis Button END -->
	</div>
	</div>

<table>
<tr>
<td> <a href="https://feeds.feedburner.com/tradereadingorder" title="Subscribe to my feed" rel="alternate" type="application/rss+xml"><img src="https://www.tradereadingorder.com/feed-icon-12x12-orange.gif" alt="" style="border:0"/></a>
</td>
<td><a href="https://feeds.feedburner.com/tradereadingorder" title="Subscribe to my feed" rel="alternate" type="application/rss+xml"> Want to stay up to date? Click here to subscribe to updates by RSS!</a></td>
</tr>
</table>
<table>
<tr>
<td><a href="https://feedburner.google.com/fb/a/mailverify?uri=tradereadingorder&loc=en_US" title="Subscribe by Email"><img src="https://www.tradereadingorder.com/email-icon.gif" style="border:0"></a></a>
</td>
<td><a href="https://feedburner.google.com/fb/a/mailverify?uri=tradereadingorder&loc=en_US" title="Subscribe by Email">You can also sign up to get updates by Email! </a></td>
</tr>
</table>

</div>

<?php comments_template(); // Get wp-comments.php template ?>

<?php endwhile; ?>

<div id="pagenav"><?php previous_posts_link('Newer Entries');?> | <?php next_posts_link('Older Entries'); ?></div>

<?php endif; ?>
</div>

<div id="bottom-advertising">
<script type="text/javascript"><!--
google_ad_client = "pub-9585424773737554";
/* Content (Homepage) */
google_ad_slot = "7668939941";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="https://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</div>

<br />
</div>

<?php get_footer(); ?>

Any ideas? I feel like it’s probably something stupid that I missed.