Question What will happen if I put a negative value on the evaluate function of PlayableGraph?

At first I thought this would make the function play the animation backwards, and if I put on another positive number of the same amount, the mod's position would go back to the original state, but after I tried I found that it's wrong. I googled it but I found nothing useful.
my code looks like this:

Code (CSharp):

1.         playableOutput.SetSourcePlayable(clipPlayable);
2.         Debug.Log(Model.transform.position);
3.         playableGraph.Evaluate(-0.05f);
4.         Debug.Log(Model.transform.position);
5.         playableGraph.Evaluate(0.05f);
6.         Debug.Log(Model.transform.position);
7.         playableGraph.Evaluate(0.05f);
8.         Debug.Log(Model.transform.position);
9.         playableGraph.Evaluate(-0.05f);
10.         Debug.Log(Model.transform.position);

here's the result I got:

And the animation clip is a loop that runs in circles