I checked again; when I click on the "Populate" button, it populates the "Parent" with "Scotlant" and Child with "DUNDEE" and "GLASGOW". This is working fine. I don't understand what do you expect as the output.
Not sure why you are getting different results. I have tried in IE8, firefox, chrome and Safari and everything works fine. If manual refresh (adding DA to refresh the child) resolves the issue, go ahead with that.