The question What's the best way to move to linux from windows for web development ? currently has four close votes, and has stayed at that number for almost its whole existence. With that many votes, I would expect that it would show up on the close mod tools page and quickly get that last vote.
However, the current votes are split between 2 "off topic" (migrate to P.SE) and 2 "not a real question". As a consequence, it doesn't show up in either of the corresponding categories on the mod tools because it only has two votes of each. Without that visibility, it's unlikely to get that final vote.
I suggest that the mod tools use the total number of close votes when sorting questions to show. This would cause questions such as the above to show up in two categories with 4 close votes each.
Update: After the mention here, the question got its final close vote. Of course, the situation described still needs attention.