not quite sure what you did. interest from EE U.S. savings bonds is taxed at the federal level but not at the state or local levels for income tax purposes.
it seems you filed amended returns correctly by filing only for the state.
However, if you used the bonds to pay qualified education expenses the interest may also be exempt for federal purposes. see this link
https://budgeting.thenest.com/redeem-savings-bonds-paying-taxes-33036.html
Thank you for your quick response. I received a K-1 for Interest Income on EE & I U.S. savings bonds after I filed my 2021 Fed and State returns. I then filed and paid additional taxes on amended returns (both Fed & State) for the K-1 Income. I didn't realize that Interest on U.S. savings bonds were exempt on State Income Tax returns. Should I file another amended to the State to request a refund?