Unfortunately, we in the Community cannot see your private tax data, so I can't see what's going on. But there is no error that I am aware of in how TurboTax calculates the deduction for the HSA contributions.
There are things that interact on the tax return that you might never expect, but because there are so many, I can scarcely ask you all of them. Your direct HSA contributions appear on line 13 on Schedule 1 (1040). This entry has the effect of reducing your adjusted gross income (AGI). Some of your other deductions or credits may be reduced by adjustments to your AGI. There is no way to know which, unless you look at every line on the 1040 and its three schedules to see what changes, besides line 13 (Sch 1).
If you want to know what is happening, this is what you need to do.
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