Welcome to the QuickBooks Community, mpoole1971. When reconciling accounts, compare transactions with your bank statement so that the difference between the records should be $0.00. If this is not the case, I have a few ways that could correct the problem.
First, make sure your opening and beginning balances are correct.
Second, look for changed, deleted, or added transactions. There are reports like the reconciliation discrepancy reports, running a missing check report, and a transaction detail report to see what could potentially throw the balance off. Use this article for the instruction to run these reports.
If you need to modify transactions that have been reconciled already, you may need to do a mini-reconciliation. This method should be used if you know the ending balance for the most recent reconciliation. With this, you will be able to fix transactions in a bank account and credit card account as well. The guidance of an accountant is always recommended when doing this.
Third, review the accounts to make sure no inaccurate adjustments were made. Once doing that, finish reconciling and examine the report.
Let me know if you need additional assistance or clarification. The Community and I are ready to help always. Keep me posted and take care.
