Fetching a wrong WSDL document for a service when two web services are deployed

Suppose you deploy two web services contained in MathService.groovy and ContactService.groovy, like this:

def server = new WSServer()
server.setNode("MathService", "http://localhost:6980/MathService")
server.setNode("ContactService", "http://localhost:6980/ContactService")

If you access the WSDL document for the ContactService (http://localhost:6980/ContactService/?wsdl), it is as if it was the WSDL document for MathService, except for the SOAP address.