title: Git commits linked to wrong user on Github, correct in git log output
body: <p>I have been using git for some months now. I am working primarily on my own, working on a <a href="http://github.com/pocketapocketa/Radical_Transparency" rel="nofollow">repository</a> primarily of .html and .txt files with a little (terrible) python. My coding skills are average at best, and I have been using linux &amp; the unix command line for 2 years at a fairly basic level.</p>
  
  <p>While I was visiting my parents in the UK, I installed git on their Mac Mini to continue working on my repository. I then set up a second repo for a different purpose and used git config in that repo to set up local values for user.email user.name etc. I set up a second github account using a different email address and pushed to it once.</p>
  
  <p>Since then, every time I push from my 1st git repository on my own computer, the commits are listed as being by the second user set up on the mac, though I never pushed there from my own computers. The output of git log on my local repo has the author as what it ought to be "Author: pocketapocketa ", but github has it as "Christopher-Rozruch". (In fact, looking over the commit history, the "Christopher-Rozruch" commits pre-date my use of the Mac Mini and the setting up of the Christopher-Rozruch identity in any form by a week or so.)</p>
  
  <p>I have searched for this problem but only found issues involving changed config files, multiple accounts on the same computer etc. <a href="https://help.github.com/articles/why-are-my-commits-linked-to-the-wrong-user/" rel="nofollow">Github's own help on the topic</a> discusses conflicts involving the same e-mail address associated with different accounts, which is not the case here.</p>
  
  <p>I have found a script to retrospectively change the git history if I decide to do this (nobody else is working on the project), but I would like to understand why this has happened.</p>
  
  <p>I have pushed to the primary repo in question from 2 computers in this time: one running on a MacBook, and one on Debian 8. The git version on Debian from which I have most recently pushed is 2.1.4. The others should be similar. The problem has been the same on each.</p>
  
  <p>Can anyone help?</p>