Review comment is not working

Hello Sir,
I am using wp product review free plugin for my post reviews.
I have enabled Show review comment box in WP Product review plugin settings. Still it is not showing review section at comment section. I am using zetpack comments.
Please let me know how to enable my users to give reviews below my review.
Check one of my review
http://www.whatvwant.com/golden-frog-vyprvpn-review/

https://wordpress.org/plugins/wp-product-review/