I recently had a question that was intermittently closed. When looking at the question history, the list of close votes differs from the list when looking at the list of voters in the review queue. Two close votes appear only in the question history, one appears only in the review queue (which also only has four close votes overall, not five).
Does the review queue only register close votes made via the queue, while the question registers votes from the question close link and the queue? Is it possible to vote close but miss the time window before some other vote was registered, and have the vote then not appear on the closing list in the history?