title: swift weird tableview scroll behaviour from tableView header section
body: <p>I have a weird tableview header behaviour when scrolling.</p>
  
  <p>When I scroll up the header sticks on top of the view and a cell scrolls under the header. </p>
  
  <p>If I scroll up more then the header starts scroll with the tableview. </p>
  
  <p>Please have a look at GIF I added:</p>
  
  <p><a href="https://i.stack.imgur.com/X9tQP.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/X9tQP.gif" alt="enter image description here"></a></p>