Reason a review shows in Connect app but not App Store?

I'm using the Connect app on my iPad. I'm looking at an app that is barely used, and I see two written reviews. But in the App Store there is only one. Any ideas what could cause this?

The review in question is reporting a possible bug, so I do wonder if this means the user retracted/deleted it.

Reason a review shows in Connect app but not App Store?
 
 
Q