After you file

So the IRS reduced it from approx. 4511 to 3600 but only sent around 2300?

If you also chose to pay any TurboTax fees out of the refund, that fee bill would be taken out of it, too, but that wouldn't account for that large of difference.

If the IRS reduced your refund, you should get a letter from them in about 3 weeks or so explaing why.  Watch for my answer below which will also tell you how to phone the IRS to ask them about it.