Your "2018 and 2019 filings?"
What software did you use for a 2018 return? The current online software program cannot be used for a 2018 return. Online is only for 2019--no other year. And you cannot combine income from 2018 and 2019 on the same return. Each tax year must be prepared separately on the forms for the specific tax year in which the income was received.
To prepare a 2018 return, you have to use downloaded desktop 2018 software on a full PC or Mac. Did you do that?
https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return