title: Rendered nodes overlap in visjs network graph
body: <p>I render a graph using visjs. The shape of the nodes are of type dot. Each node is given a custom size using the size attribute.</p>
  
  <p>When the graph is rendered some of the nodes overlap. So the graph looks like in the following picture:</p>
  
  <p><a href="https://i.stack.imgur.com/EE5ua.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EE5ua.png" alt="actual graph"></a></p>
  
  <p>I expected a graph like the this picture is showing:</p>
  
  <p><a href="https://i.stack.imgur.com/yDYf6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yDYf6.png" alt="expected graph"></a></p>
  
  <p>What am I doing wrong?</p>