This is a common
question. You should review your answers
in the HSA interview you went through previously.
When you worked on
the "Let's enter your HSA contributions" screen, if you entered the
same amount that was already was already
generated from the contributions in Box 12 of a Form W-2 you'd previously
entered, this will result in the appearance of a contribution overpayment.
Please see the
TurboTax FAQ "Why am I
showing an excess HSA contribution?" below for additional
information.
https://ttlc.intuit.com/replies/4788059