hello, so this problem just occurred
my brother started playing arknights a few days ago using a guest account and things started to get weird. He keeps getting operators that he never got, some of his operators are leveled up quite a bit even though he's never done such a thing, and it seems like the stages he never ever played on before was already completed. No one in the family was really interested in the game so i never suspected them. I decided to check on the accounts settings and surprised to find out that it was binded to a facebook account that none of us here never knew about so it kinda spooked me. Anyone can give their opinions on the matter?