GWTEventService listener triggers additional call each time the web application is displayed in the browser

I have a web service bundled with my GWT app and I'm using GWTEventService 1.1.1.  I need for the client to be notified when a record is added to the database via a web service call.  In the OnMonduleLoad I've added the event listener and everything works as expected.  For example, an external call comes into my web service to add a new user.  My listener gets triggered on this event and updates the GUI accordingly.

 

The problem occurs when I leave the URL of my application and then return sometime later, every time I get a new web service request to add a user my listener fires twice.  If I leave the URL again and return now it fires three times and so on.  I've verified that I'm only adding the one listener on startup, but I don't understand why my listener keeps triggering additional times each time I leave my URL and return later.

 

Any ideas would be greatly appreciated.  Thanks.

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