I am not explaining it well, my apologies.   Hopefully this explains it better.   

When I carry back the NOL that was generated in 2017 to 2015, it was not all used in 2015 or 2016, so the NOL that was left from carrying it back to 2015 and 2016 it is now carrying forward to 2017.  Per the 2016 general information, I have 30,054 of a NOL left to carry forward to 2017.  Now I go to the 2017 return to amend it   When I leave the prior year passive loss on the K-1 input screen of the 2017 amended return input, ( the original 2017 return generated this NOL) the NOL loss to carry forward to 2018 grows to $41,937.  If I take away the prior year passive loss on the amended 2017 K-1 input screen, and manually input the amount of the 2016 NOL to carryforward in screen 15, then the carryforward to 2018 is $25,830.   

Sorry, I have not carried back a NOL before and want to make sure I am doing it correctly.