After you file

No one can see your tax return, nor does TurboTax receive any information about your refund after you file the return, so all we can offer are guesses.  Did you pay some estimated quarterly payments and forget to enter them when you prepared your tax return?   Have you checked to see what it says in your online account with the IRS?   Have you contacted the IRS to ask why they increased your refund?

https://www.irs.gov/payments/your-online-account

To call the IRS:IRS:  800-829-1040  hours 7 AM - 7 PM local time Mon-Fri

Listen to each menu before making the selection.

First choose your language. Press 1 for English.

Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.

Instead, press 2 for "personal income tax".

Then press 1 for "form, tax history, or payment".  

Then press 3 "for all other questions."

Then press 2 "for all other questions."  It should then transfer you to an agent.