Deductions & credits

On the refinanced loan screen, if I enter $0 as the loan balance on January 1, 2021 it automatically puts $0 as the loan final balance BEFORE paid off.  Whatever I put in one box is automatically filled in the other box.  It forces these two numbers to be the same, which doesn't make sense.  The accurate answer would be $0 on Jan 1st because it was paid off earlier in the year and the actual amount that is paid off in the other box, but the screen is not allowing this.  Is this a bug?