It is unlikely that there is a bug in "HSA earnings" (actually, the calculation of the penalty for carrying over an excess HSA contribution from 2021 to 2022).
Please answer the following for YOUR 2021 TAX YEAR):
- your HDHP coverage and for which months
- your spouse's HDHP coverage and for which months
- your HSA contributions (both through your employer and directly to the HSA)
- your spouse's HSA contributions (both through your spouse's employer and directly to the HSA)
- the amount of the excess
- whether or not either of you went on Medicare and what month
- whether or not (and the amount) of carryover of excess contributions from 2020 for either of you
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