When it comes to Google not showing rich snippets in the search results for a site that has the markup, it is usually for two reasons.  Either the structured data is implemented incorrectly or there are quality issues with the site.  But according to Google, there is a third reason that Google might not show rich snippets – the way the structured data is nested on the page.

On the Webmaster Help forums, Aaseesh Marina from Google responded to a site owner whose rich snippets were not showing up in the search results, and there was a third reason given for why this could happen – the use of nesting with the structured data that had the most important markup for the page.  In this case, the most important structured data for the site owner was the product related markup, but it was nested below less important or not needed markup, such as WebPage and WebSite type.

Google picks what to show in a snippet based on what it thinks will be the most relevant information for users but you can make better recommendations so it’s easier for Google. In this case, if the Product is the top level entity, instead of being nested under Webpage, there’s a better chance for the Price information to be shown in the snippet.>