I submitted a bug in the game, but didn't receive a response that actually addressed the problem in question.  I just completed a Mission.  The one that reads "Equip a Rare ATK type Champion with 6 Offense Artifacts of Level 4 or higher".  I've done so.  Originally, I had placed 6 artifacts, but I had to remove some of them and place 2 that were less than level 4 with the 4 star ones.  It appears that I got credit for those 2.  But no more than that.  So then I removed them at considerable cost to me and put them all on another ATK hero and nothing happened.  So I'm stuck on this mission.  I cannot proceed.  My player ID is um6163647 | 6081266  I posted screenshots within the game, but I don't know how post them here, but if you take a look at my account, you'll see what I'm talking about.  Thank you.