Question about commsrc.pn

Hello ereryone. I create my PN generator with this code:

h=commsrc.pn('GenPoly',gfprimdf(3),'InitialStates',[1 0 0],'CurrentStates',[1 0 0],'Mask',[0 0 1],'NumBitsOut',1)

And this is the GF polynomial of my PN generator:

>> gfpretty(h.GenPoly)

                                             3
                                    1 + X + X 
The current states of h is:
  >> h.CurrentStates

ans =

       1     0     0

looking at the GF polynomial, I think the next statue of h should be [0 1 0].But the matlab turn the next states of h into [1 1 0] not the expected value[0 1 0].

>> generate(h);
>> h.CurrentStates

ans =

       1     1     0

Thanks for any reply