I called the IRS ([phone number removed]) regarding this and they informed me that since Turbo Tax rounded up each amount and then added all 4 together instead of adding up all 4 payments first, then rounding up or down, the math was off. The amount was more than what the IRS had in their records, even though small, it caused a flag to be raised and that's why I got the form. So this year, I am forcing the # to be what my total is and then rounding up or down. Hope this helps someone else. Thanks for everyone's replies.
