You should not have added the W-2 from 2018 on your 2019 return.
Doing so has led to a larger tax liability as you only have the 2019 standard deduction for income from both years. Reporting your W-2 from 2018 on a 2018 tax return have let you have the 2018 standard deduction.
You would be better off amending your 2019 return and filing your 2018 return.
Edited 03/20/2020 | 12:38 PM PST
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