Sometimes we get an email or a customer service ticket about a reviewer not being able to save/publish a review.
One of the main reasons for this would be because the reviewer used characters that confuse the system. I can't tell you which characters, because then this post won't go up...trust me.
So, if you use the greater than or less than symbols (Shift + , or Shift + .), your review will won't go up.
Hope that helps!