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It seems like the feature to automatically apply credits is turned on, Aecleaningsoluti.
Once it's turned on, an open invoice is paid automatically if a customer has existing credits or unapplied payments.
We can go ahead and check the settings. Here's how:
You can uncheck the box if you wish to turn off the feature, then click Save, and Done.
If you want to unlink the credit or unapplied payment to the invoice, I'll guide you how:
Then, you can record the invoice payments manually.
I'll share this article on how enter and apply credit memos and delayed credits in QuickBooks Online as additional reference.
Get back to this thread if you have additional questions. We'd be pleased to work with you again.