TurboTax appears to be using the official IRS Tax Tables.
On page 10, between 62,950 and 63,000 (i.e. 62,954). You will see that the official IRS Tax Tables show $9,645 for Single.
I don't know for sure, but I suspect that the other websites are seeing a rounding error due to using a formula rather than the official IRS Tax Tables.
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