Invoices are still showing overdue even though I've already applied the payment to them.

I can see that you posted a similar question in the Intuit Community forum, @jennyworden.

Please refer to the response posted by my peer @IamjuViel. You can use this direct link to access it: https://quickbooks.intuit.com/learn-support/en-us/reports-and-accounting/re-my-recently-paid-invoices-are-not-being-removed-from-my/01/574642#M75183

Also, feel free to read this handy help in case you have other QuickBooks concerns, such as managing your inventories, income, and expenses, running reports, setting up payments and projects, etc. to keep your business running well: QuickBooks Help article.

I'm around in the Community if you need any help. Have a nice day and stay safe, @jennyworden.