It's unlikely that this is a TurboTax error. The reason is that If TT software were double-counting peoples' withheld taxes, there would literally be many thousands of TT users experiencing the same problem (which there aren't).
It seems more likely that you inadvertently double-entered the withheld taxes, which is an error anyone can make.
I suggest you carefully review your original return. If you find that the IRS calculations are in error, you can file an amended return at no penalty.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
