If you do not understand the outcome of your 2019 return, print it out and lay it side by side with your printed 2020 return BEFORE you file it. Then compare the two returns line by line. It will be tricky because the lines are different for 2019 and 2020 Form 1040 but you can do it if you pay close attention to what the lines represent. Another thing to try is go to Forms mode with the desktop software for your 2019 return---maybe you will spot something.
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