fix

src/ui/view/UpperNodeCanvas.java

@@ -745,6 +745,7 @@ public class UpperNodeCanvas extends JPanel implements MouseListener, MouseMotio
 
 				e2 = new CpsEdge(n, k, edgeCapacity);
 
+				
 				controller.removeEdgesOnCanvas(p);
 				controller.addEdgeOnCanvas(e);
 				controller.addEdgeOnCanvas(e1);