Go back and review your entries. Search for HSA and use the Jump to HSA link. When you get to the Let's enter your HSA contributions screen, make sure you didn't accidentally re-enter the amount already listed (from box 12 of your W-2) as this will incorrectly double your total contribution amount. Unless you made contributions outside of your W-2 (uncommon), you should leave that box blank - most people do.
Why I am showing an excess contribution to my HSA account?