I just took another person's advice and I deleted the grandchildren Edvest information totally and then reentered it. The first time had no effect, but when I deleted it a second time and reentered the Edvest information again, it calculated correctly! I have no idea why reentering the information corrects this major error, but maybe it is a solution for others.
TurboTax PLEASE correct this problem for 2022 taxes.
