I suggest you switch to Itemized Deductions first, then return to Deductions & Credits and edit Medical expenses.
Go to Step-by-Step entry
Select Deductions & Credits
Scroll down and select Done with Deductions
On the screen that says Standard Deduction is best, select to switch to Itemized
Go back to the Medical expense section.
If you are still having an issue, go to Forms, Find and delete "Medical Wks" and try again. This second option will require you to enter all the expense, not just the additional ones.
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