It's a pleasure to hear again from you, @ShannonFord.

It's possible that you may have accidentally created another invoice instead of moving the existing one. To fix this, let's delete the invoice that you've mentioned. 

Here's how:

1. Log in to your QBO account.
2. Select Transactions, then select All Sales.
3. Locate the transaction. 
4. In the Action column, click the small arrow ▼ icon and then select Delete.
   
   

Another way to delete the invoices is by opening them. Let me show you how:

1. Open the required transaction. 
2. In the Action column, select the small arrow ▼ icon and then select View/Edit to open the transaction.
3. Click More in the footer and then choose Delete.
4. Select Yes to confirm.
   
   

Once done, turn off the automatically apply credits feature by going to the Accounts and Settings section. This way, you'll be able to apply for credits manually.

Then, open the existing invoice. Move it to the correct project then save the changes. Once done, apply for the necessary payments or credits. For additional info, please see this article: Add existing invoices to QuickBooks Online Projects.

I've also attached a link to help record invoice payments in QuickBooks Online. 

As always, you're free to leave a comment if you have further questions about managing your invoices in QuickBooks. I'll be happy to help. Keep safe!