Haha, I know what Trader means there.
I had the same problem, go search for "5 standard players" under my name in Help, since I'm on a Wii and can't copy & paste a link.
But, your problem is that you have cruddy add-ons that have player-type datablocks, that borrow from the "standard player" datablock, but the addon maker didn't change the uiName property of the new datablock, meaning that the script would just copy over the uiName from standard player, resulting in 2+ Standard Player's in your list.
See my thread for more info.