I have a peculiar confusion regarding the relationship between a closed-loop pole on a root locus plot and its gain and percent overshoot. I have found a point on the root locus plot that MATLAB claims to have a percentage overshoot of 5%: [![https://i.imgur.com/UqwJciZ.png][1]][1] using the following code:
``` matlab
    s = tf('s');
    gproc = ((s+3)*(s+6))/(s^2*(s+2));
    rlocus(gproc); % plot root locus
```

However, when I plot the step response, the percent overshoot seems to be 22%: [![https://i.imgur.com/CJejh4s.png][2]][2] 

using the following code:
``` matlab
    gopen = 13.71*gproc;
    step(feedback(gopen,1));
```

What is the reason for this discrepancy? Have I misunderstood the MATLAB code?


  [1]: https://i.sstatic.net/7xUfT.png
  [2]: https://i.sstatic.net/FC7ed.png