Why is Mobile legends account syncing on my other phone

My Mobile Legends MLBB app is syncing with my wife’s iPhone, instead of using my account on my iPhone and my wife’s account on her iPhone the two iPhones are syncing like when I’m logging in my mobile legends account on my iPhone it also log in to my wife’s iPhone as well, instead of my wife’s account on her iPhone and vice versa, when she logs in her mobile legends account it also logs into my iPhone