[Python] Tkinter-based app keeps running in the background if the window is closed abruptly

I've created a tkinter app designed to let users create and take quizzes locally. Unfortunately, if a user closes the window by hitting the 'x' in the corner instead of hitting the "quit" button on the main menu, the window is destroyed but the process remains in the background. It isn't a huge deal as it stops using any CPU and only holds on to about 40mb of memory per instance, but this just seems pretty sloppy for an app that I'd like to deploy.

I have no idea what specifically is refusing to exit when the window is closed, and as it could be coming from almost anywhere in my 1700 lines of code, I'm instead looking for some more general tips for identifying what's still running or for killing any remaining processes when the window is closed. I'm happy to provide my code if anyone thinks it would help, though I reiterate that it's quite long given that I can't identify the source of the particular problem.

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