Let me confirm that it does not matter which box 12 (a, b, c, or d) a number is in - what matters is the letter code.
For example, the letter DD and the dollar amount with it are the total amount that you and your employer paid towards the premium on your health insurance. It has nothing to do with your HSA.
As Catina said, the total amount that you and your employer contributed to your HSA is entered in Box 12 with a code of W.
If your screen in the HSA interview shows differently, I would have to ask you if you "imported" your W-2, rather than typing it in by hand. Sometimes it happens that the import process fails, because TurboTax did not build the data packet that represents your W-2.
The solution - and what I will ask you to do in any case - is to delete the imported W-2 from TurboTax, then re-enter your W-2 by hand. Then see if the code DD amount still shows up as employer contributions in the HSA interview.
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