Has the rotation of events in the game changed?

- with what you've said, you already answered your question. Event rotations may change depends on the month or happenings within the month (for example, Anniversary Weeks, Naruto's Birthday, Halloween and Christmas), the other factor that can make the rotation change is the devs decision and maybe a little influence from the community's feedback

But Why are they always the same treasures at this event "Recruitment Feedback?

- in this event, why its always the same treasures? maybe because, it is the majority pick of the players who responds to the Event Feedbacks. GNW and Kage Treasure are the most popular one because of their super rares .. The Han and 3rd Raikage thing is slowly fading due to the current set-up of teams, most of the newbies in the game goes straight at GNW treasure to get Naruto KCM and Madara earlier than the others and wait to get Han and Roshi as free draws .. Some others chooses to get a barrier ninja first and go to GNW treasure and after getting their first SR, they go back to kage to get SR there while farming some Itachi Susano'o frags ..