Everything matters, and unrecognized refunds should be promptly addressed, Pj.  No worries I'm here to help you verify and check the possible reasons.

To start, let's check the changes made in your account, including who made them and when. This could helps us identify the root cause.

To verify how:

1. Go to the Gear icon, located at the top right corner of the page.
2. Look for Audit Log.
    

    

   
   
   
   
3. Use the filters to narrow down the results. You can filter by user, date range, and events.
   
   

    

   

    

4. If you know the date or type of transaction you're looking for, you can use the search bar to find it quickly.
    
   
   
5. Click on any entry to see more details about the change. It can help you understand what exactly was modified and by whom.

By regularly checking the Audit Log, you can maintain better control over your account and ensure everything is accurate. If you see unusual things in your audit log, you can directly contact support to provide a further explanation. 

For more details, I'll be adding this article for a reference: How to view transaction changes in the audit history

Furthermore, here's the guide you can use in the future in taking note of customer's refund: Record a customer refund in QuickBooks Online .

I'm glad I was able to assist you today, Pj. You can always return here by commenting below if you have clarifications or questions concerning your random refund or other related topics. I'll make sure to respond as soon as possible. Wishing you productive and successful business operations!