Deductions & credits

If I enter an amount in Column B, it still wants amounts in Columns A and C. Plus, TT is telling me my refund from the gov is now almost 3 times what it was before filling in Column B. 

Medicare kicked in on July 1, 2023 so I no longer used the health care exchange. That's why there is no additional information after June. Why doesn't TT allow for that scenario? I'm sure I'm not the only one.