title: What does this git graph mean?
body: <p>Our team is new to git (we are more an svn shop). We are trying to figure out the concepts, but sometimes we see odd results.</p>
  
  <p>For example, here is a screenshot from GitKraken :</p>
  
  <p><a href="https://i.stack.imgur.com/WJDSj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WJDSj.png" alt="Git Kraken Screenshot"></a></p>
  
  <p>The blue line is the master branch, why is there a gap here? Which git command could reproduce this and is there any problem doing this?</p>