This was a TurboTax database corruption problem. My 1098 for mortgage interest was entered and displayed correctly but TurboTax used a different number for my Oregon itemized deduction. I learned how to go into Info Worksheet to force display of the Oregon itemized deduction worksheet, where I discovered the problem.
I deleted and re-entered the 1098, which solved the problem.
Many thanks to TurboTax Service and Support for taking the time to teach me how to identify the problem. Case # [number removed].
