I own TW2. But if I look in the Top Sellers list, it dose not say I own it. I live in Aus, so I am wondering if this is why its happening, as I got the TW2:The Aussie 'no sex as reward' edition.

Yeah, that's the reason why. I seem to remember one of the blues saying that they were looking into this since it was happening to so many people (presumably everyone with the AUS version), but nothing ever came from it.