I finally discovered the problem. In the personal interview, the step by step at some point asks one to check a box as to whether one's health care premiums were from self employment income. I had checked that box. This resulted in the miscalculation. If I uncheck that box, the error goes away.
In the future, there should be a line in that spot in the personal interview advising that, if one already entered employment premiums in the business section, one should not check the above-mentioned box in the personal interview.
