AdSense ads no longer appearing

I have a series of Google AdSense ads appearing on this site and now all of a sudden, they’re all gone. I have AdSense code for each as set up like this in AdCode text area:

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- Medium Rectangle 300x 250 -->
<ins class="adsbygoogle"
     style="display:inline-block;width:300px;height:250px"
     data-ad-client="ca-pub-1234556789"
     data-ad-slot="1234556789"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

You get the idea why the ‘1234556789’ should be there. To replace the actual ID’s.

Still, why did this stop working in AdRotate?

https://www.ads-software.com/plugins/adrotate/