Taxed Unemployment Causing Me To Owe

I received a relatively small amount of unemployment income and opted to have both federal income and state taxes withheld from my payments. That's reflected correctly on my 1099-G and what I'm entering into my return on TT, but as soon as I enter it, it causes my tax obligation to go up, causing me to owe even more on my federal. I've already had the 10% federal withheld, so I'm not sure why the system would calculate that I owe more.