Like others on here, the Q for Mac does not calculate the payment amounts correctly. I have to add an additional payment amount to all my loan terms in order to correctly calculate the correct amount under the "additional payment" option.
It has been this way for many years. Not sure why the leading personal finance software cannot have this correct, but other programs can like Moneydance can!
Seriously considering stopping paying for Quicken and going with a cheaper option like Moneydance. Rather manually update the transactions daily and then pay a yearly subscription for a program that doesn't properly do what it should do.