Hi there, riedabook.
The steps provided above help you avoid getting duplicates in QuickBooks Desktop. If you have duplicate transactions, they you'll able to remove them depending on which banking mode/view you're using.
Here are the steps to check your mode preferences:
Now, I'm linking an article that will help remove duplicate transactions in QuickBooks Desktop.
You can also check out this article that will help you in the future: Deposit customer payments.
That should do it. Let me know how it goes by leaving a comment below. I'll be here to keep helping. Have a wonderful day.