The GST adjustment balance doesnt match the difference of Refund and Refund Due, why is this?

Hello @melissa38,

You'll have to make sure that the payments and refunds are entered based on the correct GST filing period. This way, it'll show you the correct adjustment balance.

That being said, let's go back and review the payments and refunds you've entered to make sure you've chosen the correct filing period and affected accounts.

In addition, I'd also recommend contacting our Customer Care Support so someone can assist properly in recording the GST payments and refunds. To do so:

1. 1. Log in to your QuickBooks Online account.
   2. Go to the Help menu at the upper right.
   3. In the Search bar, type Contact Us.
   4. Click the Contact Us option.
   5. Choose Callback.
    
   For support availability time, feel free to view this article: Get help with QuickBooks products and services.
    

If there's anything else that  I can help you with, please let me know in the comment section down below. I'll be always around ready to help.