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Negative estimates with approximate Bayesian computation using the abc package in R

I am currently using Approximate Bayesian Computation to parameterize uncertain parameters of a model to reproduce observed patterns of disease outbreak presence and absence. To do this, I am using the abc package.
However, when I run the abc function to estimate the posterior distributions of the parameters from neural network regression, I obtain negative values even though all parameters are positive. I don’t know if this is related, but I have this warning: