Entering the review queue with no close votes?

This morning I found 13 questions in the "Close Votes" review queue. Of them, four I considered odd - they were not the standard questions from that queue, so I clicked on the "link" to see how many close votes they had. And they each had...none$^{[1]}$.

What is going on here? Can questions enter the review queue with no close votes?

$^{[1]}$ Well, okay, one had one, but it obtained that vote when in the review queue. So it entered the review queue with, apparently, no votes.