I'm having a problem. In season 15 it's saying that I've completed all of the seasonal challenges but that's not true. I have two left. One of them is week 7, "Conquest of the Mighty." I'm suppose to complete a Nightfall Strike on Grandmaster. I've done this a number of times and I'm not getring credit for it. The second challenge is week 9, "Trail by Firing Squad." Despite having these two quests left, the seasonal indicates (1/1) that I've completed all of the weeks. Please help... W