Blog tag URLs not outputting

I have an issue where my blog tags are not outputting the full URL.

For example the URL is output as just https://somesite.com/tag/ rather than https://something.com/tag/test

What I've tried

I've tried adding the blog app from scratch and, using the default post.php template and I'm having the same issue.

You can see this issue on my live site, for example https://jaygeorge.co.uk/blog/w3-total-cache-for-wordpress-users (scroll down to where the categories and tags are output, just before the comments). It seems like the categories URLs are fine, but the tags are short of the full URL.

PHP template code

Here is my post.php template code:

<?php include('../perch/runtime.php'); ?>

<?php perch_layout("global/head", array('blog-post' => true)); ?>
<?php perch_layout("global/header"); ?>

    <div class="s-single">

    <?php perch_blog_post(perch_get('s')); ?>

    <?php /* perch_blog_author_for_post(perch_get('s')); */ ?>

    <div class="entry-footer">
    <div class="entry-meta">
        <div class="entry-categories-and-tags entry-categories-and-tags--categories">
                <?php perch_blog_post_categories(perch_get('s')); ?>
        </div>
        <div class="entry-categories-and-tags entry-categories-and-tags--tags">
                <?php perch_blog_post_tags(perch_get('s')); ?>
        </div>
    </div>
    </div>

    <?php perch_blog_post_comments(perch_get('s')); ?>

    <?php perch_blog_post_comment_form(perch_get('s')); ?>

    </div>

<?php perch_layout("global/footer"); ?>