Hi Shane!
I’m sure you’re not the only one who has experienced the same thing. It's a good thing you posted this in the Community. I'm here to help you bring back your transaction.
To do this, you can create a bank deposit with an opening balance equity category. Then, mark it as reconciled, and this will become your beginning balance. You can also follow the steps below.
- Click on the Cogwheel icon.
- Choose Chart of accounts.
- Double-click the account in concern.
- Click the down arrow below the DATE header.
- Choose Add deposit.
- Enter the details of the deposit.
- Date
- Account: Opening balance equity
- Amount in the Deposit field.
- Reconcile field: R status
- Click Save.

This article will also give you more information about opening balances: Enter an opening balance for an account in QuickBooks Online.
You can always go back to this thread if you need anything else. Take care and enjoy your day!