title: Cells are overlapping
body: <p>I have a problem in my iPhone app. Sometimes, some cells of the UITableView of my home screen are overlapping and does not appear correctly.</p>
  
  <p>Here is how sometimes (very rarely) my app is appearing : </p>
  
  <p><img src="https://i.stack.imgur.com/4WqrHl.jpg" alt="enter image description here"></p>
  
  <p>I created two types of custom UITableViewCell, with a xib file to design them.</p>
  
  <p>Do you have any idea on what can cause this ? Is this a bug of iOS, because I already noticed this kind of bug in an other app.</p>
  
  <p>Thanks for your help.</p>
  
  <p>UPDATE : here is my tableView:heightForRowAtIndexPath: method.</p>
  
  <p>I'm returning the correct height depending on the two types of cells.</p>
  
  <pre><code>- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
  {
      Article *article = [self.articles objectAtIndex:[indexPath row]];
  
      if (article.isFeatured) {
          return 110;
      } else {
          return 75;
      }
  }
  </code></pre>