This has been confusing me for years. Why is the money that "I", not my employer, put into my HSA being listed as employer contribution on W-2? Does anyone have the 100% clear understandable answer?

I keep seeing stuff like it is already deducted from your pay in box 1. Well yes it should be because it was pre-tax, so WHY is it not being added back in by box 12? That amount is definitely being taxed, because when I remove it my return goes from $3186 to $6294