As you seem to already know, lines 16 and 20 on the 8889 get added together to go on 8f on Schedule 1. But this isn't working for you, since the number in 8f (schedule 1) is not equal to lines 16 + 20 on the 8889.
Unfortunately since we in the Community cannot see your private tax data but know only what you can tell us, I have to start a game of twenty questions.
What is the difference between the amount on line 16 (8889) and line 8f (Schedule 1)? Does this number appear elsewhere on your return?
Let me also assure you that I have been answering HSA questions for 8 years now, and I have never seen this error, so we will be able to work it out.
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