What does the warning mean?

Don't get me started on the DMV. About 20 years ago I bought a 1985 Yamaha RZVR 4 cyl 2 stroke Japanese market only bike from a guy in NH or one of these states with a registration only and no title because it was over 10 years old. I go to the DMV and the girl gave me a very hard time about it then another girl got out a book and showed her the way it is. So I'm in the clear so I thought, then she ask about the mileage witch was 9000 km but it said miles on the registration, so I told her she had to convert it from km to miles. Instead she just put down 9000 and marked the title as inaccurate mileage. I didn't even notice till I got to the parking lot and proceeded to flip out. I go back in and demand to see the manager explaining that this is a very rare bike and the mileage is accurate but the manager said once its printed it can't be undone, it's in the system.