I was questing in Redridge Mountains and have moved on from that zone. However, I have repeatedly tried to abandon the quest ‘He Who Controls the Ettins.’ I don’t think that is the kind of quest where you have to get rid of an item in your bag to get rid of it completely, but I did check. Every time I click to abandon it, it automatically reappears and auto-accepts.
Based on WoWhead, this bug is about to celebrate it’s 10 year anniversary.