So here's my scenario, my Date and Time and forgot to change it to correct it before playing Moon. I have my Pokepelago active (20:00 pokebeans effect). Then I just realized that my date was incorrect (set on December 15) when I saw it while saving so I decided to correct it. After loading the game again, the time left on Pokepelago was not decreasing. Even the new developed Islands is not changing after a day. So it's messed up now.