Unemployment repayment- not sure what amount to state that I paid back since I opted for my taxes to be withheld at the time that I would be paid

I opted to have 10% of taxes to be withheld from my unemployment so that- for example- if my total was $100, then $10 would be taken out (with $90 left). I was told by unemployment that I was determined to have been overpaid- so they took the money out of the account without having to contact me about me paying them (was still getting payments at the time). When I answer how much I had to pay back in Turbotax, would I need to account for the specific tax affecting my overpayment? 
Using my previous example, if for example $10 was collected (so that I kept $80)- would I say that I paid $10 or $10+tax* or $10-tax* where tax* represents the tax specifically for that overpayment. Please explain as if I was a kid (I have been getting really confused with this). Also- why does Box 1 of 1099-G form have my unemployment compensation be the pre-tax, pre-overpayment amount (e.g., the $100 instead of perhaps the $80)?