so recently some people have noticed their GamerScore has dropped. after looking into this, it was determined this is because the value of some of the Achievements in Rayman Fiesta Run has been reduced to allow for 5 new achievements, while still keeping the total for the game at 200 GS. why would they ever do this? this seems to be the first time this has happened, however many times they have added new achievements with title updates and simply added more GamerScore.
here is the game in question: https://account.xbox.com/en-US/Achievements/Xbox/1431509853