Do you fall back down to the Earth when you jump, Jerome?
If you throw a ball into the air, does it come down?
What do you think causes this?
Since an acceleration is involved (measured and confirmed repeatedly and easily), there must be a force acting on the object cast into the sky.
This force causes an acceleration.
Scientists choose to call this force gravity.
The ISS follows the exact same path predicted (and counted upon) if it were to be acted on by this thing scientist call gravity.
But, plainly, you don't think gravity is strong enough.
So there must be some other force, that acts in the exact same way gravity does, has the exact same effects as gravity, but is stronger. Since it is stringer, it will overwhelm small-scale applications such as jumping and throwing a ball.
So what is it scientists have been observing, measuring, calculating, and relying upon for hundreds of years, and which we mistakenly labelled "gravity"?
To give you a chance to answer, Jerome, I'm taking you off ignore. Please don't make me regret it.