This is my own answer on Skeptics to the same issue, heavily edited by Shog to add some details:
It's the number of reviews available to anyone. As of a couple weeks
ago, anyone who has earned the moderator tools
is shown the total count of pending reviews in all queues rather than
just the number of edits they can review.
You might ...
Your flag was handled by the 'Community' user as helpful.
When you flag that a post should be closed but don't have close privileges, it puts the question into the Close Votes queue. If another user sees the entry in the Close Votes queue and decides to vote to close for reason of the dupe you marked, the flag is considered 'helpful' and disappears, and ...
Simple answer: replication as a tag is a synonym for dna-replication. Entering a synonym makes the system to replace it by the main tag.
In the past it has only been used synonymous, so at one point the synonym was created. Look here for tag synonyms.
There is no need to ask this on meta.stackexchange, this is a topic which can be found in our help center. I really recommend that you take a look and read the important topics there. This gives a much better understanding of the community.
Regarding your reputation loss, when you downvote an answer, this person who wrote the answer looses two reputation ...