Looks like a Singular error, the first Hilbert series and second Hilbert 
series returned are not consistent:

{{{
sage: gb = I.groebner_basis() 
sage: h1=hilb(gb,1) 
// ** _ is no standard basis 
sage: h2=hilb(gb,2) 
// ** _ is no standard basis 
sage: Zt=ZZ['t'] 
sage: f1=Zt(list(h1));f1.degree() 
33 
sage: f2=Zt(list(h2));f2.degree() 
3 
sage: f1-(1-t)**30*f2 
4294967296*t^22 - 4294967296*t^21 + 4294967296*t^20 - 4294967296*t^19 + 
4294967296*t^18
}}}


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