While I have found that items are sometimes duplicated when looted by other players making the cloned item oddly unusable, when that happens logging off of the server will fix the items glitch or cause it to despawn, signifying it was not really there to begin with. For these items however, only the wire despawned, the SK remains but cannot he used it reloaded (or even put in my hands), the Xmas lights also cannot be picked up or used, and the hammer is behaving completely normally. The glitched items now sit in a wooden crate and can only be removed by picking up the crate and dropping the item out of it (still not able to be picked up).