**Why do some posts require only one vote to handle:**

[link to review][1]  
![enter image description here][2]  

[link to review][3]  
![enter image description here][4]  

**While others require multiple votes?**

[link to review][5]  
![enter image description here][6]  

[link to review][7]  
![enter image description here][8]  


(All of these examples are from the Low Quality queue.)

<hr>
###Update:

**Perhaps this is a clue?  It's obvious others reviewed *this* post:**  
[link to review][9]
![enter image description here][10]


  [1]: http://superuser.com/review/low-quality-posts/391382
  [2]: https://i.sstatic.net/FTWYW.png
  [3]: http://superuser.com/review/low-quality-posts/391383
  [4]: https://i.sstatic.net/4XqTZ.png
  [5]: http://superuser.com/review/low-quality-posts/391122
  [6]: https://i.sstatic.net/rghiP.png
  [7]: http://superuser.com/review/low-quality-posts/391324
  [8]: https://i.sstatic.net/o92Rx.png
  [9]: http://superuser.com/review/close/392519
  [10]: https://i.sstatic.net/SAeZP.png