I live in Europe where mortgages without a down payment are quire rare unless you have an extra house that is at least 75% of the value of the new one you want to purchase. This being the reasoning because of which it is there.
About the whole gray placeholders - you are correct. I will fix that!
For user experience, the grey fields made me think they weren't editable or clickable until I got to the point of adding early payments.