Welcome back to the Community, @travelqueen.
I've got the help that you need in finding the three missing bank entries on your register.
Let's make sure that you pull up the right date of your transactions. This can be the reason they're not showing up in the register.
To do that:
- Go to the Accounting menu at the left pane.
- Refer to the Chart of Accounts.
- Locate the bank, then click the View register at the right under the Action column.
- Click the Funnel icon above the Date column.
- Select the transactions' Status and its Type. Then, enter the date afterward.
- Hit on Apply.

If the problem continues, I recommend undoing the categorized transaction from the banking page and add them again.
Here's how:
- Open your QuickBooks Online account, then go to the Banking tab at the left pane.
- Select Banking, then look for your account.
- Click on the Categorized column.
- Choose the item/transaction, then tap on Undo under Action.
I've added this screenshot for your visual reference.

To guide you in categorizing your bank transactions and on what to do if entries are missing, you can always scan through these resources below:
Please let me know how it goes by leaving a comment below. If you need anything else, don’t hesitate to ask. I’ll be here to help. Have a most pleasant day!