Guild Wars 2

I’m working for the “Saving the City of Gold”-Achievement currently and prefer to use the Armors to help other players. But there is a annoying bug, which makes you lose the armor when entering Tarir or after the challenges. Today I lost to times in a row my (silver) armor and at the very same run one time my (gold) armor after the challenge. I couple of days ago I even lost two times the gold armor right after the challenge.