title: Git merge did not merge, just added all commits to master
body: <p>I merge one branch back into master and there was no merge commit, all the commits from the other branch now look as if they where committed to master.</p>
  
  <p><strong>What I did:</strong></p>
  
  <p>In SourceTree I selected master, selected merge, selected the most recent commit and merged it. It showed I needed to push my 39 commits, so I did. Only then did I realize that there was no merge commit.</p>
  
  <p>How can I reverse this? It's awkward that the commits show as if they where all made to master.</p>