My bank account reconciled, but on the next month it said that I was off by $7,000.

There are a few reasons why a reconciled bank is off, gthtqb.

It's possible that you printed a different account or after you've printed the reconciliation report, someone edited, deleted, moved, or unreconciled an already reconciled transaction. This changes the ending balance of your last reconciliation, which impacts the beginning balance of the next one. It can also be that someone manually reconciled a transaction, so it didn't show up on the next reconciliation.

You can check the report again to see the changes made to the transactions within the reconciliation period. Let me show you how: 

1. Go to the Reports menu and search for Reconciliation Reports
2. Select the Bank and the Report period. 
3. Click View report on the correct reconciliation.

In the first section of the report, you'll see the changes made to transactions within the reconciliation period. To help you fix the discrepancy, you can use this link: Fix issues for accounts you've reconciled in the past in QuickBooks Online.

Feel free to mention me in your post or reply if there's anything else that you need help with. Take care!