DIfficulty while drawing diagrams


When I try to use diagram component, it seemed cluttered after drawing a few diagrams. Link to the diagrams cannot be drawn easily and even if we manages to draw the link, it breaks when after adding another link.
Please look into the issue.


Snippet in question can be accessed via https://snippet.dhtmlx.com/xshe9ut7?_ga=2.229802719.294167136.1631889981-1549123795.1624533597&mode=wide


Could you please, provide an actual snippet, as the linked one - is a default initialization snippet.