Hello there, @finance37,
You can only match one bank transaction to the other two deposits you've manually entered with different amounts. Please see the attached screenshot below for your guidance.
What you can do is exclude bank transactions, then add the two deposits to the right bank account. By doing so, this won't create duplicate entries on your register.
Here's how to exclude them:
To learn more about matching entries on your banking feeds, feel free to read through this article: Match and Categorize your downloaded Bank Transactions. You will see detailed and troubleshooting steps in downloading deposits from your bank or credit card account.
Let me know if there's anything else you need by leaving a comment below. I'd be glad to help you out.