title: Pull request contains commits from master
body: <p>I branched from master a week ago.</p>
  
  <pre><code>master -&gt; my_branch_1
  </code></pre>
  
  <p>During this time I've made commits to <code>my_branch_1</code> and also rebased on <code>origin/master</code> several times to keep up.</p>
  
  <p>State of the branches ATM (conceptualised)</p>
  
  <pre><code>commit0
  master -&gt; my_branch_1
  
  master:
     commit1
     commit3
     commit10
  
  my_branch_1 (commits from master are marked with *)
     commit1*
     commit2
     commit3*
     commit4...commit9
     commit10
  </code></pre>
  
  <p>The problem appear when I attempt to open a PR back into <code>master</code>. PR log show all commits <code>1...10</code>, while I expect only commits <code>2, 4...9</code> would appear.</p>
  
  <ol>
  <li>What have I done wrong?  </li>
  <li>How should I fix this?</li>
  </ol>
  
  <p><strong>-- EDIT --</strong></p>
  
  <p>Clarification on the <code>origin</code> discussion in comments. The intention was to receive commits that happened on master into my branch. </p>
  
  <p>This was the desired outcome as I wanted to stay as close to "<code>master</code>" as possible to keep in sync with the rest of the code base.</p>
  
  <p>What I don't want is to have these commits that are already in <code>master</code> appear in my PR that I'm doing into <code>master</code></p>
  
  <p><strong>-- EDIT 2 --</strong></p>
  
  <p>This issue is with a private repo, hosted on GitHub. Not a forked repo.</p>