Your W-2 is correct. Box 12 Code W should include both your and their contributions made via payroll.
When TurboTax asks "Any contributions you personally made (not through your employer)" DON'T enter the amounts you contributed through paycheck withholding. It has already been considered through your W-2 entry. Personal contributions refer to contributions you send directly to the HSA via check or EFT, not through payroll.
