Why do I get the wrong output in MATLAB with this code?

Why do I get the wrong output in MATLAB with this code? The gain in the counter is 2 in my input, but 0.5 in the output
s = zpk (s s #);
g5 = (2 * (s + 8)) / ((s + 3)(s + 0.1)(4 * s + 6));
%%Output

g5 =

    0.5 (s+8)

(s + 3) (s + 1.5) (s + 0.1)