Retirement tax questions

@dmertz This was a personal contribution (my employer does not contribute to my HSA), and I did include that contribution in my 2019 TurboTax return. My confusion is due to my 2020 5498-SA form, which includes this contribution in box 2's "Total contributions made in 2020". I did not expect that payment to be included here because it was designated for 2019. However, the IRS instructions for the form say it should be included: https://www.irs.gov/pub/irs-prior/i1099sa--2020.pdf. Should I simply subtract that payment from box 2's figure when prompted by TurboTax for my total 2020 contributions?