Strange,,,,,, about half of my O.Express items come over twice (on the odd occassion more than twice) I'm on Supanet.
It might be something to do with 'leaving message on hub' box ?!?!
I'm not sure, but if you leave it on the ISP hub, it might just be getting sent more opften ?
For my part, I just put up with it now,,, & delete the duplicate.