Quest Issue: MQ eroded leather leggings bug

[Darfindle]

I have had all the eroded leather armour MQ'd except the leggings,

a friend shaman was selling me the MQ for the leggings and when he did the hand in he ended up receiving the leggings.... very strange but maybe it was just luck that some idiot has handed cobi frostbeard in thurg the gems.... so he refunded me the money and I tried finding the mq from somewhere else, we also petitioned it but gms said nothing they can do as they don't support mq's...

so today I hear of it happening again with someone and eroded leather leggings mq.... surely this cant be some idiot giving 1kpp of gems to npc... sounds bugged?!?!