Is this a bug??

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Hey, i just started playing HeRO recently again after a little break..thanks to the new(?) item sharing in party options, other players are looting OBBs dropped because of MY mimic card.. now, im all for loot sharing, its great for priests and such who would usually not get much loot.. but why should other players get to have my OBBs from a card i worked my ass off to find? i think this needs to be fixed.. i love the party loot share otherwise and its really annoying to have to have it set to individual just to avoid getting my OBBs stolen. (im sure the same applies to those who have myst case cards, or other such cards that give % to drop something...)