different results using simlink and script

 I would like to ask why I got different results (step response)  using Simulink  compare to script 
although the system is simple unstable second order

Script:

Ksn=5000; Ki=158; m=3.14; Kx=1.58e6; Kp=10; Td=0.001;

 s = tf('s');                          

 G= Ksn*Ki/(m*s^2-Kx)                   

 Gc=Kp*(Td*s+1);

Gl=G*Gc;

Gf=feedback(Gl,1);

 step (Gf)