Symptoms

I have a client notification.
Below the notification I can see a bunch of junk text and URL's.
If I try to edit the notification, I cannot see any parameters or text that explain where it is coming from.
 

Diagnoses

What seems to be happening is that the Datafields being used in the Notification Email is being duplicated and added to the end of the Mail Template.
 

Resolution

Two solutions:
1. Change the Email in the Wizard to Clear Text. Make sure there are no New Lines below your Email Text. Change back to HTML and redeploy

2. Delete the Client Event, recreate it and redeploy