Adsense ads not displaying on Index page

Hello,

I’ve integrated 2 Adsense ads (with same code) between the posts on homepage but none of them are appearing. The ad code is present though and can be seen using ‘View page source’ option.

I’m unable to figure out as why these ads aren’t showing up now. (They used to appear before). The code for the ads is mentioned below.

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- CM_WT_HP_TC_Responsive -->
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-1257872154896248"
     data-ad-slot="4135022739"
     data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

I’d really appreciate if someone can help me out.

Thanks