diff -r e8327b4e8b8b -r 9a3d5fdbf296 server/python/django/renkanmanager/utils.py
--- a/server/python/django/renkanmanager/utils.py	Mon Jan 05 17:29:55 2015 +0100
+++ b/server/python/django/renkanmanager/utils.py	Mon Jan 05 17:36:33 2015 +0100
@@ -87,8 +87,10 @@
                 if c=="northwest":
                     self.cat_nb_nodes[c].append({ "x": offset, "y": order*500 })
                 else:
-                    self.cat_nb_nodes[c].append({ "x": 100*(i+offset), "y": order*500 })
-
+                    if (i%2) == 0:
+                        self.cat_nb_nodes[c].append({ "x": 100*(i+offset), "y": order*500 })
+                    else:
+                        self.cat_nb_nodes[c].append({ "x": 100*(i+offset), "y": order*450 })
 
 class CircleNodePlacer(NodePlacer):