You are correct that if you had Single HDHP coverage for the full year and were 55 or over, then the HSA contribution limit would be $4,500.
First, please tell me where you see the $150. Remember that we on the Community cannot see your tax return nor the screen you are on.
If the $150 were a penalty on excess HSA contributions, you would have first gotten an excess contributions error during the HSA interview. Did you?
Second, the HSA excess contributions penalty is assessed ONLY if you do not tell TurboTax that you will withdraw all of the excess before April 15th.
Third, if you really had an excess contributions penalty, it would appear on form 5329 in Part VII. The 5329 is used for a lot of different penalties, so if you have a line filled in here, please tell me which lines have entries (and what they are).
Fourth, while $3,799 should be under the contribution limit, if you carried over any excess contributions from the prior year, then this excess counts as a personal contribution in the current year. Sometimes, this puts you over the limit.
Anyway, please come back and tell us if you got the excess contributions message and what values you had on the 5329.
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