In ProSeries Basic, I had 2 dependents listed on the parents return, a carryover from 2019.  I deleted the top dependent, to file their own return, but left the second dependent on the second line.  Only 1 dependent showed on the 1040, BUT since line 1 was blank, the recovery rebate credit calculated another dependent and added $1100 ($500 + $600) to the return.  I had to move the dependent up to the first dependent line in PART III Dependent Information.