Fit looks good but parameters are odd.

[LydiaMak]

I am fitting an SED and although my fit looks good the parameters are oddly distributed (especially tage) and MCMC results look odd. I keep in general the initial parameters and priors as default except

    model_params["lumdist"] = {"N": 1, "isfree": False, "init": ldist, "units":"Mpc"}
    # Let's make some changes to initial values appropriate for our objects and data
    #model_params["zred"]["init"] = 0.0
    #model_params["dust2"]["init"] = 0.05
    #model_params["logzsol"]["init"] = -0.5
    model_params["tage"]["init"] = 13.
    model_params["mass"]["init"] = 1e9
    
    # These are dwarf galaxies, so lets also adjust the metallicity prior,
    # the tau parameter upward, and the mass prior downward
    #model_params["dust2"]["prior"] = priors.TopHat(mini=0.0, maxi=2.0)
    #model_params["tau"]["prior"] = priors.LogUniform(mini=1e-1, maxi=1e2)
    model_params["mass"]["prior"] = priors.LogUniform(mini=1e8, maxi=1e12)