Star Rating not showing in Rich snippit of Search engine results

Hello,

I’m using the WP Customer Review plugin allready for 6 months on the homepage of my site Bloemen bezorgen Utrecht. Customers can review my flower delivery service there. As you can see I have allready 7 reviews.

The Google rich snippit testing tool is showing the star rating (https://www.google.nl/webmasters/tools/richsnippets?q=bloemenbezorgenutrecht.nl), but the starratings are not shown in the Search engine results.

I hope someone can have a look at my site and help me solve this problem. It would be mutch appreciated.

Kind regards, Jan Pieters