I don't find it suspect (well, suspect of what exactly?) as a native to these cities but I may lack perspective. Go one city over all over the Bay Area and you get wild differences. There's a lot of land between north bay cities too. Also, weren't we all just using these divergences a year ago to back up Covid statistics - i.e. Santa Rosa was higher than surrounding cities from my recollection, and that was "expected" one you knew the areas.