To be clear, you ARE supposed to enter your W-2 information on your W-2.
And in the HSA interview, when you are asked if you paid for anything out of your HSA, you must answer "yes", so that you can see the screens into which you will enter your 1099-SA information.
However, when you are asked about "personal" HSA contributions, do NOT enter the amount from box 12 on the W-2 or any part of it.
However, because we don't know what you've entered, please do the following to clear all HSA data from your return before you start over with the HSA stuff again:
1. make a copy of your W-2(s) (if you don't have the paper copies)
2. delete your W-2(s) (use the garbage can icon next to the W-2(s) on the Income screen)
*** Desktop***
3. go to View (at the top), choose Forms, and select the desired form. Note the Delete Form button at the bottom of the screen.
*** Online ***
3. go to Tax Tools (on the left), and navigate to Tools->Delete a form
4. delete form(s) 1099-SA (if one), 8889-T, and 8889-S (if one)
5. go back and re-add your W-2(s), preferably adding them manually
6. go back and redo the entire HSA interview.
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