The browser may be loaded with internet file processes that make invoices in QBO appears as overdue though it's paid. I'd suggest using an incognito/private browser to check if this a browser-related issue.
Also, private browsing mode prevents internet files that make QBO acquire this behavior.
Open a supported browser and here is the keyboard shortcut to open a private browser to sign with QBO:
Google Chrome: Ctrl + Shift + N
Mozilla Firefox and Internet Explorer: Ctrl + Shift + P
Safari: Command + Option + P
If this fixes the issue, you can clear your regular browser's cache so your browsing history can download fresh pieces of data and information. Otherwise, use another supported browser.
If the issue persists, I recommend reaching our Care Support team. They can pull up your account with their backend tools. Also, they can create a case and investigate it further.
Sign in to QuickBooks.
Go to Help on the top right.
Enter "Talk to a human" and then type your query like "overdue invoices".
Click I still need a human.
Hit Contact Us.
Please know that our staffing is limited, and support hours are reduced due to COVID-19. We're available every Monday-Friday. We'll get back to our normal hours once our staffs are safe to work.
You can let me know if you need further assistance. I'm always here to help. Stay safe and well!