What is the difference between "State Estimated taxes for 2016" and "2015 state estimated taxes paid in 2016".

We paid a one time estimated tax of 1000$ in April of 2015 for 2015 taxes. We paid a one time estimated tax of 2008$  in April of 2016 for the 2016 tax year.  (Don't like paying quarterly)  If I read correctly my input to the turbotax questions would be $2008 for state est. taxes for 2016 and 0$ for 2015 state est. taxes paid in 2016.   If so, WHY do the Federal taxes increase 506$ (inputting 0 from inputting $2008)