I voted to close the following question because the OP posted the exact question couple of days ago before posting this question. I remember that because I edited the original question with formatting. OP copied the edited question and posted a new question with couple of changes on the title. Below given question was posted only yesterday (February 17, 2013).
I am sure that the question that I used for the duplicate reference had 1 answer. The answer did not have any upvotes though.
What I noticed:
The question used for duplicate reference has been deleted. I don't know who deleted the question (whether OP or moderator).
Close votes (there were two votes) on the above mentioned question have disappeared.
Searches on Meta:
Below Meta post shows that when someone can delete their own question.
Below Meta post shows when a close vote will disappear.
Did the OP delete the original question because it had only one answer with no upvotes?
My understanding: The Meta searches show that only questions with multiple answers cannot be deleted even none of them had up votes. I assume that OP can delete the question since there was only one answer with no upvotes.
Did the close votes disappear from the above-mentioned questions because the question used for duplicate reference was deleted?
My understanding: The Meta searches show the close votes will disappear only if there were at least 100 views or the last close vote had elapsed 4 days. In this case, the above-mentioned question has only 29 views as of writing this post and the question itself was posted only yesterday. These conditions do not meet the criteria to expire the close votes.
Update: (17:45 UTC)
I just noticed that when I click Close link, I get the below message but there are no close votes count displayed on next to the link. I don't find anything on the revision history of the question that suggests a moderator modified something.
Is this behavior because a user is allowed to close a question only once and I already voted to close this question?