I have encountered the following discrepancy related to a closed question:
Question was normally closed by 5 regular users (not hammered by a moderator). However, review history reveals only 2 votes.
What is the explanation for this?
There are two ways to cast close votes on a question (for users with sufficient privileges, of course):
The close-votes cast via these two methods are added. But only those cast via the review queue appear in the review history. Those cast on the question itself do not.