If the amount on Form 1040 line 4b is also greater than it should have been, then you need to file an amended return for 2021 since your taxable income amount was incorrect.
Also, go back through your tax records for 2021 and check any Form 1099-R that you received. Make sure you did not have a corrected Form 1099-R that may have been entered as a separate form on its own. Also, consider whether you had any distributions that were rolled into another like-kind retirement account. Those distributions would be reported on line 4a, but would not be included on line 4b as taxable.
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