Are there any major changes from 2019 to 2020 that would decrease my return?

Are there any major changes to federal or Oregon returns from 2019 to 2020? There aren't drastic changes in my income, my tax paid, or my itemized deductions, yet receiving about 1k less for both federal and state returns. I think more concerning is the state return, when I play with the numbers to enter things that were similar in 2019 OR return doesn't seem to budge.