Compare your return line by line with last year's. Since you have the Desktop program you can switch to Form Mode to look around. You may have entered an amount wrong, made a typo or left out a decimal point, etc. And you have to double check anything you imported like Fidelity. It might have imported wrong or got in twice, etc.
By the way did you get the new 6,000(12,000) Senior Deduction on 1040 line 13b?
ps.....the 1040-SR is exactly the same as the regular 1040 but has bigger type so it goes on 3 pages instead of 2.
