TurboTax Premium 2018: when completing the rental property questions, the headings for the years are incorrect (showing 2016 and 2017), when it should be 2017 and 2018)

Go ahead and complete the form as if the headings were correct, but I've reported this to TT because the product needs to be updated there. In general the labels are not part of the calculations, although they obviously have to be updated every year so they are correct.