Hello, @Ballroom Fit. I'll provide some information and steps on matching transactions in QuickBooks Online (QBO).
 

Adjustment notes or Refund receipts will indicate an expense which is why you're unable to match them with a Deposit transaction posted in your bank feeds since QuickBooks can only link the same type of transactions. Let's exclude the payment (Deposit transaction) and edit the Refund receipt by selecting an account instead of Undeposited funds to match it. 

To exclude the payment, here's how:

1. From the left menu, select Transactions.
2. Choose Bank transactions.
3. Go to the For Review tab and check the box of transactions you want to exclude.
4. Select Exclude.

To continue, let's edit the Refund receipt.

1. From the Sales menu, locate the Refund receipt and re-open it.
2. Under the Refund from field, choose an account instead of Undeposited Funds.
3. Once done, click Save and close.

See the screenshot below:

I'm also adding this article incase you'll encounter some challenges while reconciling your accounts in QBO: Fix issues the first time you reconcile an account in QuickBooks Online. 

Please don't hesitate to reach out to us again if you questions about matching your bank transactions or any other concerns within QuickBooks. We always have your back. Have a good one.