tina-ti current overshoot problem

Hi,

I'm trying to observe how current varies in response to the changing of potentiometer value.

Here is my current plot when potentiometer is 50, 100, 150, 200....

The problem is, there is no overshoot in this plot. (In real life circumstances there are always overshoots)

Why is that?

Thanks!

Here is where I put the AM1

Here is the transient graph of AM1