PITTSBURGH — It was widely billed as the first uplifting story in the aftermath of the earthquake that devastated Haiti’s capital: two young American women rescued 54 Haitian orphans in an airlift organized by Gov. Edward G. Rendell of Pennsylvania and supported by top Obama administration officials. . . .But for 12 of the children, last month’s airlift transported them from one uncertain predicament to another. As it turns out, those children — between 11 months and 10 years old — were not in the process of being adopted, might not all even be orphans and are living in a juvenile care center here while the authorities determine whether they have relatives in Haiti who are able to take care of them.