In my summary of the federal refund, it says that I had $xx withheld and does all the other math around that.

The issue is, I am not sure where they are getting that number. I had a certain amount withheld that is not that number from my math. Should I just trust that if I entered all my forms correctly, that Turbotax did the math right? How can I double check? I already looked at the 1099s entered.