I think this is already old bug, maybe it is in the client side? or in some of GM Commands?
Maybe the problem is in /teletome Gm command? sometimes i used that command and its happen a lot of times already.
and another old bug, when you press tab-tab or run&walk bug(PVP), You can't see the bug in your screen but on other's screen its already teleport you to him and you can advanced defeat him.
and another old bug is that you can trade all untradable items except in consume and materials tab, you want some vid? i can make it