Total State Credits and Payments

hi,

Turbotax calculated Total State Credits and Payments of $[100].

The State sent a letter asking for copies of "Income Tax Witheld from W-2s and 1099s".

When I add up the sum of my wife and my income tax witheld from W-2s, I see $[80]. 

 

I need to be able to send supporting documentation. How can I find how Turbotax calculated the $[100] ?