rigid body causes object to fall upwards

I added a rigid body to a cube with no script and with a collier but instead, it falls upwards instead of downwards. I have tried changing the mass to a negative number to reverse the gravity but when i run it automatically changes back to default.
Does anyone know why this happens and how i can fix it?
Im using unity version 2019.2,

Edit > Project Settings > Physics

Your gravity should be set to a negative number