stars not showing in recent reviews

Sorry, it’s me again:
Somehow the stars don’t appear in the recent reviews, neither if they’re generated by shortcode, nor in the widget – just a blank space left there.
The markup then looks like this:

<div class="author-rating" itemtype="https://schema.org/Rating" itemscope="" itemprop="reviewRating">
<span style="width:40%;"></span>
<meta content="1" itemprop="worstRating">
<meta content="2" itemprop="ratingValue">
<meta content="5" itemprop="bestRating">
</div>
<div class="review-summary" itemprop="description">This is a test review.</div>
</div>

Another question: is it normal that they don’t appear anywhere but on the reviewed post single.php ?

https://www.ads-software.com/plugins/mage-reviews/