Why is my 1099-SA reimbursement for previous years medical subtracted from my current 2020 medical expense since I am trying to itemize vs using standard deduction

I am retired and have an HSA and this year I requested reimbursements for previous years qualified medical expenses.  It is not for reimbursement of current year medical expenses that I wanted to use to itemize vs standard deduct.  Turbo assumes i was reimbursed current year medical (not previous years) and subtracts from current year medical expense.   
But