Not showing Snippets

Hello,

Thank you for contacting Rank Math today.

Rank Math plugin adds the necessary markup for rich snippets. It may take some time before they show up in the search results, please allow a few days for Google to pick up the information.

Google will not necessarily show the rating stars, though, they check a few things first and may choose not to show, for instance, they check the overall quality of the site, and if the review content is representative of the main content of the page or not.

Here is a quote from one of the Google’s help article:

We perform algorithmic and manual quality checks to ensure that structured data meets relevancy standards. In cases where we see structured data that does not comply with these standards, we reserve the right to disable rich snippets for a site in order to maintain a high-quality search experience for our users. Read our webmaster guidelines for more details.

Link:

https://developers.google.com/search/docs/guides/intro-structured-data#structured-data-guidelines

I have checked your page source and the JSON-LD data is already available on the page as shown below:

Hope that helps. If you have any further question(s), please let us know. Thank you.