Cannot reset a repo

From: Martin Wendt <martin17@wwwendt.de>
Date: Dec 6, 2014, 10:27 UTC
Message-ID: <5482DA16.4080509@wwWendt.de>

Hi,

I am facing this problem:

  - Using git version 1.9.3 (Apple Git-50)
  - cloned a fork from GitHub to my local machine:
https://github.com/mar10/cdnjs/
  - This repo seems to be broken in some way.
    At least it is not clean from the beginning and I am not able to reset
    `git reset --hard` only toggles the modified file from
".../sortable" to ".../Sortable" and back
    (see attached screenshot)

Is this a known problem (with case sensitivity)? Any suggestions how to fix it?

Thanks Martin