Now I'm wondering if the age of the reviews might factor into it if there is less than 3. For the 2 you showed with stars, they both had reviews over 2 years old. Wolf Rock did not. However, that theory doesn't hold up with this business who has a 5-year old review:
New advertising option:
A review of your product or service posted by a Sterling Sky employee. This will also be shared on the Sterling Sky & LSF Twitter accounts, our Facebook group, LinkedIn, and both newsletters.