The bug is that undelete votes are never cleared.

See in the [revisions list](http://stackoverflow.com/posts/20620509/revisions):

>![][1]

There are indeed three undelete votes, and will be forever. :)  

This also cause other weird looking bugs, like [this](http://meta.stackexchange.com/q/191119/152859):

><img src="https://i.sstatic.net/5FzDI.png" />

  [1]: https://i.sstatic.net/44Pkg.png