Different results inputing 0.4 and 0.40

[AndresCenteno]

using Distributions, StochasticAD
v = [-1; 10]
function X(p)
    u = rand(Bernoulli(p))
    return v[u+1]
end

derivative_estimate(X,0.4) # this is 0.0
derivative_estimate(X,0.40) # this is 18.333333333333336

don't really understand why it is different, don't want to bother anyone, I'm just messing around

[AndresCenteno]

so I just closed and opened Julia and it works now