or it could be that Nordyke comes alphabetically before Obama? Preparation of the birth certificates in the hospital is an administrative function, not done in the delivery room sequentially. And even in 1961, they were likely done in batches, to be delivered to the mothers within a few days of the birth.
The dates of filing at the State Department of Vital Records would reflect that — in this case the Nordyke twins certificates were entered into Vital Statistics AFTER Obam’s certificate was, yet their serial numbers come before!
That’s kind of a hard thing for which to think of an easy explanation. Little facts are the quicksand that captures a cunning fraud.