Hello there, @joanne24. 

Thanks for coming back for more support. Let's also ensure that the Automatically apply credits box is unchecked or off so the payment amount won't pre-fill or automatically apply credits to the next invoice you create for the same customer. Simply follow the same steps outlined by my peer above. 

In case the problem persists, I'd suggest you use a private or incognito window to identify if you're going through a browser-issue. If it works, that means it has something to do with your browser.

To resolve the issue, go back to your default browser and follow the steps to clear Intuit -specific cookies in this help article: Clear your cache. If none of the steps work, try using a supported, up-to-date browser. 

For future reference, read through this help article: Should I use an invoice or a sales receipt?. It will help you learn about when to create an invoice or a sales receipt to record transactions. 

Let me know if you have additional questions, @joanne24. We're always around here to help.