I ran your code exactly as it's posted here and got
[{s: 1.51111111111111, q: 0.0, z: 0.0, p: 0.0}, {s: 1.51111111111111, q: 0.0
, z: 0.0, p: 0.980392156862745}]
I'm using SymPy 1.1.1. Perhaps your version of SymPy is old?
By the way, it's better to use the assumption
sm.symbols('p, q, z, s', nonnegative=True)
although this doesn't change the result.
There is a difference: negative=False just says it cannot be negative, but
it might be a complex number like 2+3*I. While nonnegative=True means it's
a real number >=0.
It's rare that setting an property to False is needed, with exception of
commutative=False (and that is because commutative is True by default.)
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