It's not really a bug. It's incredibly complicated. We have dungeons set up that reset weekly. When someone starts a dungeon they are completing that quest line since we implemented dungeons into the quests. So when people are part of the same team, it shares all the progression meaning ...
Making a quest that uses an OR filter seems to not apply properly. I tried making some crop quests with Farmer's delight installed and it ends up doing weird things like Beetroot completing Cabbage quests or vice versa. I have FTB Xmod compat installed just in case. Crashlogs No response ...