It's exactly what Joy outlined. Plus, many sites are getting fed up with seeing the same items uploaded over and over again with simple color variations or just multiple submissions of the exact same item on their sites.
Apparently some people are making multiple uploads at Renderosity that all link back to the exact same item here but are placing them in different catagories there so that they're seen by people searching on catagories at that site. That's not something that can be fixed from this end. That's up to the user to comply to.
It is a miracle that curiosity survives formal education. - Albert Einstein