Reconciling differences in credit cards

There are a few reasons for this to be happening.  The most common I have listed below.

• Someone entered an incorrect opening balance when they created the account in QuickBooks.
• Someone added transactions that are older than the opening balance, but didn't edit the original opening balance entry to reflect the change.
• 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.
• Someone manually reconciled a transaction, so it didn't show up on the next reconciliation.

For whatever reason your beginning balance is no longer correct, you can reference the resource article I included below to help you find the discrepancy and correct the previous reconcile.
https://quickbooks.intuit.com/learn-support/en-us/bank-deposits/fix-beginning-balance-issues-if-you-... 

If you’ve followed everything in our reconcile guide but still have questions, connect with your accountant. They can help get back on track.