While it is disappointing when a "sexed pullet" turns up as an oops cockrel, the process used to sort genders of chicks is a rather complicated one and is generally 85 to 95% accurate meaning that even in sexed pullets there is that 5 to 15% chance of getting the oops male.
That is a buff orpington cockerel.
TSC does not sell actual pure ameraucana (the hatchery they order from marketthe chicks as such, though), so none of your birds will be what you thought they are. You can ost photos of the others and we will Id them for you