I got the system phase 360 led by using d2c ??

I want a continuous system from a discrete system below.

Pd=tf([0.00320391 0.0292170],[1 -1.55077 0.664572],0.18)

but I get the continuous system (=d2c(Pd)) below.

why I get the system phase 360 led??

[Mathieu NOE]

the two phase curves are shifted by 360° which is equal to 0° in fact

a transefr function with phase phi or phi+360° is the same

you can always retrieve 360° from the second plot if you want to overlay the two bode plots