There was nothing to "catch" early on. USCIS does not ask for original documents....nor should anyone send original documents unless USCIS specifically asks for them. Consulates (part of The Department of State), on the other hand, are VERY specific about stating that they want to see original civil documents. USCIS is not part of DOS. The OP's issue occurred at the Consulate...not USCIS.
In your case, the consulate will still want original documents at the interview.
Since Consulate Officers are the sole approval authority for all visas, they demand originals in order to ensure authenticity.