UPDATED 2.14 Issue (Gold/Hero XP rolling over to zero) With 3.0, we’ve added a cap for the amount of Gold and Hero XP you can have on hand. As stated above, there was a problem where you could roll over if you went over the max. We’ve set the max to 2.1 billion for any resource that does not have a set cap. No more can be earned after the cap, and we advise anyone reaching 2 billion of Gold, Hero XP, or other resources that fall under this cap to spend the resources to avoid hitting the cap.
The Trophy for Chapter 21 has a different name, and so it is not allowing players to claim the reward. Essentially, it’s asking you to complete a Chapter that isn’t there.