HSA contributions for tax purposes

This should already be represented in your W2. You shouldn't need to enter it separately on turbo tax or other online filings.

It has been a while since I contributed to an HSA (retired) but I recall having that same issue/confusion. I just did what TurboTax said to do and it took care of the rest.

I can not say I understand it, and sure can not explain it, but I was confident TT made the correct calculations.

It doesn't matter because the HSA cap is an absolute cap that both employee and employer must follow.

This is unlike a 401k where the employee and employer maxes are very different (which add up to an absolute max).

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and I am prompted to provide my personal contributions to the HSA, but every contribution is listed as made by my employer.

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Contributions made through your employer are not considered "personal contributions" in this sense. This is true even if the contributions were made out of your pre-tax wages.

You already got the deduction via the pre-tax deal. If you enter them in here as well, the software may try to give you an additional deduction.

If you did't contribute the money pre-tax through your employer, you would enter here and take the deduction at this time.