Your line 8f amount (the excess contributions) consist of the excess amount in your code W amount in box 12 of your W-2 ($375) plus the taxable amount of your HSA distribution (you said that only $6k of your distribution was for medical expenses, so the remaining $82 was taxable). This makes the total of $457 that you see on line 8f.
In addition, there was a 20% penalty on $82, so line 17c on Schedule 2 (1040) has the $16 penalty.
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