1099-R due to over funding need to Amend Previous Taxes

I got a 1099-R  for 2019 taxes due to overfunding a 2018 Roth IRA.  I had contributed too much in 2018, and when I was doing my taxes, I found this out.  Because of that I had withdrawn the amount that was required before taxes were due in 2019 for the 2018 taxes.   However, it appears I need to Amend my 2018 taxes.  In doing so, I'm not exactly sure what needs to be changed.