IRA withdrawal - part-year state resident

I am 70, moved from NJ to PA last spring, and after moving to PA made some withdrawals from a traditional IRA. I expected based on other posted discussions that I would not owe NJ state tax for withdrawals made after moving out of state. But on TurboTax it's coming up that nearly 95% of my withdrawals are still subject to NJ tax. As I entered the info in TurboTax, there was an item "Amount received and taxable during NJ residency", and a check-box for "Check if distribution is non-taxable in NJ". No matter what answers I give here (e.g., zero and checking the box), I'm still being taxed in NJ. Am I misunderstanding, or doing something wrong? Thank you.