Was this vehicle 100% business use?  Or was is a 'shared' personal and business vehicle, and the business percentage varied from year to year?

100% farm/business...  sorry had to feed the cows!

I must have keyed something wrong, never had this problem before

Double check that it is showing 100% business, and that you didn't enter any personal miles.

If that is correct, I don't know why it is doing that.  Perhaps try deleting the entire asset and re-enter it?

That fixed it...  he had zero miles for 2018.  Literally sold it off farm 1/1/18.  I put down 1 mile and it's fine now!  THANKS!!!