We have confirmed an issue with the Skill Up & Fusion Bonus from the 80 Million Worldwide Downloads Event. The event announcement stated that there would be a 6x Skill Up & Fusion Bonus; however, in-game it showed that there was a 5x Skill Up & Fusion Bonus.
This issue has been resolved as of 1/14 (Mon), 7:37 PM (PST). The Skill Up & Fusion Bonus has been changed to 6x as intended. The in-game text may still display 5x, but the Skill Up & Fusion Bonus will be the corrected 6x. If you do not see the changes implemented in-game, please completely exit and restart the app before trying again.
See here for more information on the 80 Million Worldwide Downloads Event.
We sincerely apologize for the inconvenience and appreciate your understanding.
Thank you for playing Puzzle & Dragons.