Not Saving my game! – Gacha Studio (Anime Dress Up) Review

I love this game and I just got it yesterday...but every time I shut off my phone... my pets are gone,my characters changed to the original,and all my arena stats are reset! I don’t know if this is a bug or if it’s normal or unless I’m just not seeing something. Please tell me if there’s a way to save it!
Review by Luna - San on Gacha Studio (Anime Dress Up).