Not all bugs are imported into the game, sometime it is entirely blizzards fault and somebody just goes off and dupes their mistake making a new outbreak of bugged items, like the wizspike ring... it was legitamit at one point before it was massively duped.
I still personally believe that blizzard allows 1 in so many items to be bugged on purpose because they always said they wanted a player to be able to have an item and nobody else have it... ie WF & GF, but they have been duped so many times that everyone has one now.