One of my products allows anonymous review submissions

[Allen_K]

I have VM 2.6.0a set up to allow reviews only by shoppers who have purchased the product. However, I have a single product that allow anonymous non-registered or logged-in users to submit a review (which should not be allowed). All other products perform as expected.

Joomla: 2.5.20
VM: 2.6.0a
Page: http://www.certifiedinfosec.com/estore/cis-professional-membership/cis-body-of-certified-professionals-detail

What's going on? Ideas?