title: Untiy LeanTween easing giving me strange results
body: <p>I'm using LeanTween engine and all was going well until I tried this:</p>
  
  <pre><code>LeanTween.moveY (menuPanel, 1200f, 0.5f)
              .setEase (LeanTweenType.easeInOutBack);
  </code></pre>
  
  <p>The goal is to have the menu panel move down slightly before shooting up out of the screen. The easeInOutBack seemed the correct type (based on <a href="http://easings.net/" rel="nofollow">Easing Cheatsheet</a>).</p>
  
  <p>menuPanel is a GameObject UI Panel of which I declare as public and assign in the inspector.</p>
  
  <p>Instead it goes a little crazy, bouncing up and down sporadically whilst moving a bit.</p>
  
  <p>Has anyone observed this behaviour before, know what I'm doing wrong?</p>