Since this is an amendment of a 2017 tax return, you are using the CD/downloaded version of TurboTax and you can experiment without saving any modifications. I suggest deleting each individual Form 1099-R until the rollover indication disappears, indicating which of the Forms 1099-R is causing the trouble, then close the file without saving. Begin again, then delete and reenter just the offending Form 1099-R. Should also be able to switch to forms mode and examine lines B1 though B8 of TurboTax's 1099-R forms to see where a rollover is indicated.
In forms mode you can also examine TurboTax's 1099-R Summary to find amounts being reported as nontaxable due to being rolled over.
