Is MATLAB giving a wrong root locus? Maybe a bug?

Hello, I am trying to obtain a root locus with the following code which has 3 poles and 1 zero:

if true
clear all
close all
clc
num = [-0.1654 -0.0367]
den = [1 3.27 -20.23 -24.95]
rlocus(num,den)
axis([-10 10 -2.5 2.5])
end

The problem is that ML is giving me a strange result because it has a path on the right side of the biggest pole. The figure shows:

I tested in other software and it gave different results that seems more reasonable, like this one:

So, I am doing something wrong or it is a bug? My version is R2014a.

Answer 1

[Arkadiy Turevskiy]

There is no error with your code or bug in MATLAB. It just seems you got the sign wrong. If you do rlocus(-num,den), you will get the root locus you expected to see.

[Arjun Sheshadri]

Could you explain why it is like that