Thanks for bringing this up, I went through the code and found a small problem with the logic. So yeah, there was an actual bug. I fixed it and released a new version (2.1.2), so go grab that and try again. :)
Also, I noticed that you had included two runner files, the development version and the minified production version:
<script src="js/jquery.runner.js" type="text/javascript"></script>
<script src="js/jquery.runner-min.js" type="text/javascript"></script>
You only need one of those. So while you develop your code, you can use the non-minified version and when you're ready to push it to production, just include the -min version, which is a lot smaller.
I hope this helps!