I also have this problem.
Thank you for your post. This can happen if you edit or change a transaction from a previous month, it will cause the transaction to become unmatched.
At this stage, you would need to undo the most recent reconciliation, then keep undoing until you get the reconciliation with that transaction. Then match and re-reconcile that month, then do the same for each month going forward again, until you're back to the current date.
I have attached our Help Articles with details on this process, which may help:
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