Do you know why turbo tax is stating I overfunded my HSA, even though I didn't?

Check your entries in the HSA section of your tax return to confirm everything is correct:

1. Go to Federal > Wages & Income > Less Common Income > 1099-SA, HSA, MSA and click Start/Revisit.
2. Make sure you have HSA selected.
3. Enter your withdrawals from your HSA by answering Yes to Did you use your HSA to pay for anything in 2021?
4. Assuming you did not inherit this HSA, select No.
5. Under Let's enter your HSA contributions your employer amount should already be in there from the W-2. Only enter an amount in the contributions you personally made if you made any out-of-pocket contributions. Do not include any paycheck deferrals, those are already accounted for on your W-2. 
6. Did your employer tell you about any other contributions? This is uncommon.
7. Answer if you had Medicare and select the HDHP plan you had all year. If your plan changed in 2021, make sure to indicate that as that will affect your contribution limit. 
8. If you had an over-contribution from a prior year, it may have automatically carried over. To see if you had an overcontribution from 2020, you can check your 2020 Form 5329, Line 47. 

If it is still calculating an over-contribution and you are over age 55, make sure your birthdate is entered correctly in the My Info section of your return.