I don't know whether or not this is a correct explanation, but the USFA has historically had a number of different databases (excluding the current "shadow" copy of the membership database (official database on an archaic USOC-owned/operated mainframe, "shadow" copy on a USFA server that will be taking over official duties with the new season)). The membership database was not the same as the database from which information was drawn for such things as seeding lists for NACs, and still another database was used for accounting purposes such as paying tournament officials (empirical evidence gathered from failure of changes of information to propogate between these various applications).
I'd guess that the BTH field you're seeing is in the tournament database, but the information with your card is from the membership database. One is correct, the other is not.
Best bet is to drop an email to something like
info@usfencing.org with the correction.
-B