[web2py] response not displaying correctly in iframe

[simon]

Please can someone explain this.....

When I enter test using the code below then I can see a page with "TEST" 
and  "CONTENTS" which is what I wanted.
However when I open test/4 it shows three nested iframes  each with "TEST"

def test():
    response.view="default/test.html"
    return dict()
def webpage():
    return XML("CONTENTS")

test.html

TEST
<iframe src='webpage.html' scrolling="no" width="100%"></iframe>