Can i frist ask you, are you using the Toolkit or using the Application?
If you are using the Toolkit could you please post your code so i can see what way you are importing the data.
Also i notice in your Edges file you have the following targets: 22131,20322,22414,23748 pointing to 10811 (herpes zoster)
These target nodes are not listed in your Node table. From what i gather i think they need to be listed in there before you can give direction in the edges table? (Someone back me up!!)
Try adding 22131,20322,22414,23748 to your nodes table, give them a label and see if that works
I will try and look at this tomorrow for you.