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You may need to review the dates of transactions. The dates matter if they're not within the date of the reconciliation period.
So, if the payments from the last month were cleared in the next month, they will not be included in the last month's reconciliation but will appear in the next month.
You can also check this article for other issues you can fix when reconciling: Fix issues when you're reconciling accounts in QuickBooks Online.
For other best practices and helpful resources, you can check the following links below.
Reconcile an account in QuickBooks Online
Learn the reconcile workflow in QuickBooks
Let me know if you need anything else. I'll be here to help if you have follow-up questions. Take care and have a good one.