Changing gravity also changes object weight?

So basically, all I'm doing is reversing the gravity like this Physics2D.gravity = new Vector2(gravity.x, -gravity.y);. But when I use the AddForce function on my player's rigidbody after I change the gravity, the force seems to be impacting the object way more than when the gravity is normal. I'm jumping approximately 5 times as high when the gravity is reversed. The y force that I apply is exactly the same other than it being negative. Does anyone have any idea why this happens?