Shumi's 3rd Jump Quest can't be completed

Issue/Problem/Bug: Upon clicking the Chest to complete the PQ it gives you a message saying "Someone has taken the item already." I've done this three times already, and once right after a server check so it's obviously not a mistake on my part. Changing channels just warps you back to Kerning so it's a wasted effort each time it happens.

 Images of problem