One month of bank reconciliation is missing

It's nice to see you here, @sf_ola,

To make sure this reconciliation issue is fixed, make sure that the previous reconciliation data has no missing entries or modified transactions. These instances will most likely affect past reconciliation history. 

Any changes made to a previously reconciled will remove the reconciled status. To check the transaction status and make sure all January 2020 entries are complete and was tagged as reconciled, follow the steps below:

1. Click the Gear icon.
2. Tap Chart of Accounts.
3. Find the account you want to review.
4. From the Action column, click View register.
5. Locate the entry from the list and make sure the status column (indicated by a check mark) does show a code R (Reconciled).
6. If it doesn't, click the field until you see a letter R on it.
7. Once done press Save.

8. To give you an idea on how it looks like in QBO, see this screenshot:

    

   

You can also find these steps from this article: How to manually reconcile or unreconcile a transaction.

I'll be leaving a few related links that has the checklist and troubleshooting for reconciliation problems in QBO:

• Fix issues for accounts you've reconciled in the past in QuickBooks Online
• Learn the reconcile workflow in QuickBooks

Please update me if you have any questions with the steps or need further assistance with the reconciliation. I'll be available to help any time.