You'll want to consider deleting and recreating the transactions to correct them. I understand that this is a lot of work, however, the option to change credit card credits transactions to expenses isn't available in QuickBooks.
First off, let's find and delete your credit card credit entries. Here's how:
Click Expenses from the left menu.
Select the Filter drop-down, then choose the date when the credit card credit entries are created.
Select and open the credit card credits.
In the Credit Card Credit window, click More at the middle bottom.
Click Delete and Yes to confirm.
Repeat steps 4 to 6 for the rest of the transactions.