Hi rh3231,
It's great to see that you're using QuickBooks Online for your business needs. I know at year-end you want to ensure your records are accurate. I can guide you to the right support.
When you see a discrepancy in your accounts, finding the cause is the best way to assure accuracy. Review these articles that go through finding the discrepancies in your reconciled accounts and how to resolve them:
If you're still unable to clear up the difference you may choose to create an adjustment. If you're unsure about entering an adjusting entry, I suggest you contact your Accountant. If you currently do not have one you work with, you can find one familiar with QuickBooks through this link: Find an Accountant.
If you're looking for further assistance with your QuickBooks Online product. I'm here to help. Have a great day!