Hello there, Kim.
Let me get the help you need in displaying the reference number of your transactions on the Reconciliation page in QuickBooks Online (QBO).
The numbers that'll show depend on the type of a specific transaction and if there's a reference number entered. To further investigate why there are no reference numbers showing on your transaction, I recommend opening the transaction by clicking on edit.
If you encounter problems when reconciling your accounts in the future, refer to this handy article to resolve them: Fix issues at the end of a reconciliation in QuickBooks Online.
You're always welcome to comment below if you have follow-up questions when handling your transactions. I'm just around to help. Take care always.
