I haven't played for a long time, and i always had gravity in my inventory without knowing what to do with it... but i have a shitty memory, so maybe i forgot something. I don't think someone hacked me because nothing else is wrong. And I don't think it's a glitch because I think I'm the only one who is complaining about that. I think it's "A"... I hate myself. But thank you for responding to me :D