Hello there, @amarillolifttruc.
I can help you figure out why your paid invoices are still showing as overdue in QuickBooks Online (QBO).
If you entered a payment through the Bank Deposit instead of Receive Payment, the payment wouldn't be linked to the invoice and it will remain unpaid which will show as overdue.
Let's find the Deposit entry in your Bank Deposit to marked your invoice as closed. Here's how:
For additional reference, you can check this article to learn more about creating invoice transaction and to record the payment: How to create an invoice.
This will get you on the right track. Fill me in if you have additional questions about the invoice status. I'd be happy to answer them for you. Have a good one.