Hi,
I was checking your site and I found something strange: if you check the source code for example on that page:
https://renoel.com/categoria-producto/perros/perros_alimentacion/
… I see some lines between the dataLayer declaration and the GTM container code that does not belong to my plugin:
<!-- Analytics Data Layer -->
<script>
dataLayer = [];
</script>
<!-- End Analytics Data Layer -->
This line re-creates the dataLayer that was previously filled in with proper content making GTM not to see anything that my plugin adds.
BTW: did you really wanted to add a 1 star rating just because you have an issue on your site?