While TurboTax definitely has its problems, your problem has nothing at all to do with TurboTax.
The IRS took that long to process the return, not TurboTax.
The IRS sent you the other stimulus payment (if you did not actually receive it, that is a completely different question), so that is why the IRS reduced your by $600.
You could have had your taxes prepared some other way other than TurboTax, and you would still have had the same results.
